Asshole bipolar roommate

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So backstory; my roommate admitted to being bipolar after his gf broke up with him for a few days b/c he's very controlling/lacks empathy & takes his anger out on her. It also came out that his dad disapproves of him & he constantly seeks dad's validation/covets his opinions. All of this is making him worse as you can imagine & he refuses to get therapy b/c he's got a huge superiority complex.

Basically when he's in a mood he gets super angry at minuscule things & will berate or undermine you for them in a loud exaggerated way, especially when hanging out in a group of people. You'll say something he doesn't like & he'll scowl then question & condescend you. It doesn't help that he's extremely well spoken & has a loud voice (borderline yells when talking). He can make anyone look/feel like an idiot & dominates all conversation. If you retort he gets even more angry, sometimes to the point where he just clenches his fists and starts shaking for a few seconds.

What should I do to get him to stop? I really don't care that daddy doesn't love him & he has multiple disorders, tough shit, but my roommates/friendgroup keep telling me I should just put up with it and be there for him. I don't trust him around my guns b/c he's talked/joked about killing himself & everyone in the house multiple times. Everyone feels the same about him but keeps putting up with his shit because we've known him so long, this really can't continue.