What is satirical about a sticker that says "Kill the President?"
The only satire is revealed should one visit the play, akin to defending a threat made out loud by stating that you explained that it was satire on your computer at home.
Jail these traitors. [Of course had we had a RAT president, anyone even insinuating death would have been rounded up and had the IRS "sikked" on them at the very least]
The sticker says "I'm Gonna Kill the President". You left out the first two words to make it sound like an order, which it is not.
Either way, they are treading very thin ground. But I'll always defend the 1st Amendment. Putting on a farcical play about someone who wants to kill the president is not treason, just like owning a gun that could potentially kill the president isn't (and shouldn't be) illegal.
Guns don't kill people. Words don't kill people.