it doesn’t suddenly become inappropriate

downpunxx was not saying that it was inappropriate. They're saying that the current political temperature is high, and as a public figure, Gass's comment could put a target on Tenacious D as "woke liberals ruining America". Right now, that's a dangerous label to have if you aren't anonymous on the internet, and doubly so if you were planning on spending a lot of time in front of audiences over the next few months. Even if the chance of a violent event only went up from 0.1% to 0.5%, canceling is just the smarter move. Why risk it?