If you dislike their politics, so be it - donate to campaigns or personally run against them. Write a letter explaining how you'd like them to vote.. But the amount of absolute crass behavior people allow "because it's the internet" is mind boggling.
he basically needs to step down from the podium now or he's going to hurt the cause of making sf better, which is really unfortunate.
Altering consciousness is a human trait which I support in the end. Doing unreasonable things while in altered states is a consequence, and likewise fine as long as things as nobody really gets hurt.
Saying strange things or stirring up controversy by having unpopular opinions or hurting someone's feelings a little... not a big problem. Apologize and move on.
What happened here is pretty far across the line, though.
It was pretty close to a death threat and served to encourage others to get even closer. I'm not quite sure if it should be illegal, but it should get a public figure fired.