While true (about the malignant prosecutor and keeping a low profile) you are basically conceding your First Amendment rights in doing so. Couple that in with a number of people won't modify their gun in any way because the persecutor will attempt to paint it in a premeditive negative light.
It almost directly parallels being cowed into only CCing when OC is also legal, because you can avoid the hassle/court time that a malignant cop might direct your way.
While I don't festoon my stuff with such, I have a few snarky shirts (one of which got such attention from said malignant cop), I am prepared to defend my choices with logic and the knowledge of my rights. Of course the problem comes the deliberate entropy of the legal system, they intend to break you financially and many lawyers won't fully push and pull all buttons/levers in making the case becuase of the time and expense of doing so.
In the end, justice and our rights suffer for it by not standing up for ourselves.