Being Compliant of an unjust law could be a necessity at times and a good strategy sometimes, but rarely both. But in the case of Gideon the Valorous, it was both a Necessity and a Strategy.
The Midianites, who were the Overlords to the Israelites, extracted tribute in the form of  agricultural produce, which probably kept the Israelites poor, with no reserves or leisure – the twin benefits of prosperous activity. Each day’s labour was expended on earning their bare livelihood.
In these hard times for the Israelites, the Overlords kept an eye on the Compliance of the rules the Midianites had made to keep the Israelites in that state of want and lack of leisure.
Seeming to be compliant yet threshing wheat near the wine press keeping his activity out of the view of the Midianites was the valorous man Gideon.
The Midianites, Amalekites and the children of the East came in multitudes like grasshoppers and entered into the labour of the Israelites and destroyed the very source of their sustenance. This impoverished the Israelites.
I can imagine what a plight it would have been when mere numbers are used to subjugate a people in their own land; depriving them of the very source of their sustenance and making them labour without pride & having to conceal their labour and the meagre rewards which accrue out of such clandestine labour, in their own lands. Can one forgive the perpetrators of such cruelty? I guess not.
I can imagine a Gideon, a valorous man, slinking and threshing his homegrown wheat in his own land, gathering the same and saving the wheat for his near and dear ones- all because he was ranged against a multitude of men who outnumbered his clan. Yet that spirit in Gideon sustained him to not give up, but toil in silence and in the dark and gather as much as possible.
When that ass seeking King Saul spared the Amalekite King Agag, much later despite Prophet Samuel’s instructions, did he recall the plight his ancestor Gideon suffered at the hands of the Amalekites? I guess not. Saul was protecting Agag the king of the Amalekites. Samuel definitely had a longer memory of how that Amalekites had attacked the Israelites from the rear, harming the women. children and the enfeebled lot on their journey to Canaan.
Even if Saul hadn’t read that history, he should have had some idea of how a valorous man like Gideon had to cower under the Overlordship of the Amalekites and should have diligently carried out the instructions of Samuel. Alas, Saul didn’t! Saul became a big man in his own eyes – rightly spotted by Samuel and questioned.
Gideon, a valorous man threshing in the dark and away from the sight of the Amalekites had a reason. The Amalekites attacked the enfeebled and the impoverished, having no MANLINESS in them nor the courage to risk and make a frontal attack on their enemies.
An Amalekite doesn’t need your land, he needs your wheat and corn- the finished products. An Amalekite doesn’t want to administer, he just needs all the resources from others.
Moses was able to identify this trait in the Amalekites very early. The Amalekites stole or used violent means to obtain the resources of others without expending any labour on it. At Rephedim, Moses anoints them as enemies of God.
If I have not yet convinced the reader about the ways of an Amalekite, look at that Amalekite who found the same Saul – who wanted to save the life of Agag the Amalekite – in a moribund state leaning on a sword in the mount of Gilboa begging the Amalekite to deliver the coup de grace on Saul. That wretched Amalekite dares to kill a King, though ostensibly at the king’s request. Who knows? There were three, one was the dying Saul, the other was that wretched Amalekite and finally, as always, the Almighty. Out of this one killed the other and very rarely God stands as a witness in such sordid human affairs – except in the case of Abel. Now that Amalekite narrates a story to David, the ultimate story teller. David, the Shrewdest King of Israel, knows better‼️ The Amalekite steals the crown and the bracelet from the dead Saul and takes it to David for a reward.
David was DAVID. Uses the opportunity to redeem his own image in front of the Israelites – especially the Benjamites but also kills the Amalekite for having dared to have been responsible for the final blow to the dying King of Israel. David remembers how to handle an Amalekite – spare them not!
So Gideon was dealing with these type of Amalekites and that needed outward compliance for SURVIVAL – that compliance was strategy.
There is another kind of compliance – Compliant so that one doesn’t take up an issue which carries no purpose.
Jesus, while in the flesh, asks Peter whether the Kings collect customs and tribute from their own children? Peter promptly answers in the negative and Jesus says something absolutely BRILLIANT and becomes Compliant of those unfair Laws, without any Conviction in what he recommended to Peter to do. Read the following:
Matt 17: 24 & 25
Notwithstanding, lest we should offend them, go thou to the sea, and cast an hook, and take up the fish that first cometh up; and when thou hast opened his mouth, thou shalt find a piece of money: that take, and give unto them for me and thee.
Jesus tells Peter to pay not out of the offerings given by people or any other laboured money, but tells Peter to cast a hook and pay the money found in the mouth of the fish as tribute/ custom for Him and Peter. He demeans their greed by getting the money from a fish. 
I sense the contempt Jesus had for such unfair taxation; and the method He used to defray the tax liability was amazing. 
I see this episode as a clear proof of Compliance without Conviction. 
In keeping with His saying : Render unto God that which is God’s, and unto Caesar that which is Caesar’s, that piece of money that came out of a fish’s belly, is paid out to the Caesar.
Don’t rebel when your rebellion is to no avail. Just comply WITH CONTEMPT!