Jack Black is a stand-up guy. If anyone is condemning him for this, then they either don't know his character or are just being silly. He's always been about doing the right thing. He doesn't support trump, but he also doesn't want to end up with a shooting at one of their shows.

Every single story I've read/ watched with him makes it clear that he's just a good guy all around.

People are forgetting there's nuance to this kind of thing. He doesn't want to cancel the shows. They obviously love playing music, or they wouldn't be doing shows anymore. They have tons of cash they don't need more. This is purely trying to keep the band, the people that work for the band, everyone at the venues, etc, safe.