In the first place, I don't recall saying (or even implying) that your main argument was "invalid."
Secondly, the right to a trial by a jury of one's peers is NOT the "only" defense a common guy has against government excess. It is a hugely important one. But it is not the "only" one.
Finally, I have no idea what you mean when you say tht the government and the courts have been "chipping away" at it. When? How? By saying that a trial jury is not authorized to nullify a law duly enacted by the representatives of the People in the process of law making spelled out in our Constitution? That's not a chipping away of anything. Frankly, with the possibility of some exceptions, I submit we are all better off without giving a jury the explicit "authority" to nullify OUR laws.
Here's a counter example. It involves rape law and marriage. It is now a bit dated (at least in NY) but it can make the point anyway:
It used to be that no male could be convicted of raping his wife (either because a woman was deemed, legally, to be something like chattel OR because her "consent" was implied by virtue of having married the guy OR because the law recognized the legal fiction that a marriage made man and wife "one" -- and one cannot rape one's self). Then the law changed. And now, if a man forces himself sexually on his wife against her will, he can be charged with and convicted of rape even if they are married.
But what if the jury doesn't LIKE this new development in our law? Is it "ok" for a jury to nullify it?
Why are you taking this personally? I did not say that you implied my argument was wrong. I was merely expressing my agreement with your point, and then arguing mine.
The jury is the only defense the common man has against government excess because it is the only one where the common man is actually involved. All the other avenues of redress you are thinking of rely on the government to change itself. Even voting for a candidate is effectively trusting another man to give up power once he has it, and that rarely happens. Once people have power they tend to hold onto it, even if their intentions are good, because they think they can use that power to accomplish good.
Juries are our only defense against that short of armed rebellion against the government. While the last is an avenue that is open to everyone, we have plenty of present day examples to prove it is not very effective. It worked in the past because the government, despite the fact that it had armies, did not have a technical advantage over its citizens.
As for what I am talking about, a jury used to be trusted not just to judge the facts, but to actually judge the law. The very first jury trial held before the Supreme Court (yes, they actually used to have jury trials) acknowledged this in the instructions it handed down. Today we are told that juries do not have the right to judge the law, they are required to follow it as they are instructed by the judge.
It is absurd to tell someone that they can sift through evidence about DNA, ballistics, and forensic reconstruction of a crime scene, understand science that they are not educated about, determine which witnesses are telling the truth, and send people to their death, but they are incapable of figuring out if a law is being applied morally. If a law is so outrageous that you feel you should not apply it, you should have that choice.
Will that result in guilty people going free? Yes. I just happen to think the alternative is worse. Under the present system we have people going to jail for making bank deposits,
Deposit the "Wrong" Amount of Cash in Your Bank, Go to Jail - Hit & Run : Reason Magazine
Or for importing and selling flowers.
Federal SWAT Raid Over . . . Orchids. - Hit & Run : Reason Magazine