If Beanie is THAT quick to stop the stream after a remark like that, he must have someone on staff who goes over with guests a list of things to NOT say on the air and one of them is any reference to violence unless you're talking about something that happened.
IF that "you have to kill them" remark was what did it, that is. I'm really not sure. Could he have said something before that? From that little sliver of video, Ariel Pink doesn't seem to earnestly suggest violence or even make a joke. It wouldn't have blipped on my radar as anything dangerous at all, but I don't have a big Youtube channel to protect.