I don't think that's what went down, I think they're just doing PR damage control behind closed doors. I don't think this has actually effected their relationship. Jack Black is definitely not a supporter of trump at least.
Look I'm not saying that it's a good thing that the shot missed. I'm just saying that it's understandable how someone might want to not say the quiet part out loud when it doesn't make a tangible difference on who ends up being president come January, but does make a tangible difference on how much money they make.
Publicly calling for violence against the man who might be a dictator of the country you live in this time next year isn't exactly the safest play either, long-term.
We need to keep Trump out of the white house, but advocating for that "by any means necessary" is a dangerous play, no matter how much you personally agree with the people making such statements.