Dear Justice Letter Lyrics

Another pretty obvious one. It's a letter to former Supreme Court Justice William Brennan complaining about the ultra-conservative lineup Reagan & Bush had appointed after Brennan retired.

When I first heard this song, I had no idea who "Justice Brennan" was; and I figured, given the treatment he gets in these lyrics, that he was an a-hole.
I've since learned that William Brennan was the Antonin Scalia of his day, only on the other side. And so now, I'm troubled by these lyrics. Is Picciotto really condemning a man who did so much good for his country for retiring?
Also, what's meant by "shoot me lightly"? I'm fairly certain Brennan never uttered those words.
...brennan just retired and guy doesn't want to see him to go.
...brennan just retired and guy doesn't want to see him to go.

Guy Picciotto addresses “Dear Justice Letter” to famed liberal Supreme Court Justice William Brennan, bemoaning the fact that the great judge had retired the previous year, leaving the Court stacked with conservative Reagan/Bush–era appointees.