I think it's very possible that a change in meds could help your son a lot and reduce or eliminate the anger/violence.
My son wasn't as violent as yours, and he's far from well, but it's like night and day if I compare this summer to last summer.
It's been a long journey, with three different drug trials and 5 hospitalizations in 10 months even though he was med compliant most of that time.
I know some people do well on Abilify, but my son's never been on it, and for some reason, I've never felt comfortable with it because they started off marketing it to people as a depression add-on very early. That just gave me the feeling it wouldn't be strong enough for my son.
And, if your son has a strong mood component to his illness, which it sound like he does, an anti-depressant could kick off some mania.
I think there's a lot of hope for your son & your family, but it might be a long, difficult journey to get where you guys need to be.
You mentioned what happened in your state. In my state, Virginia, we had something similar happen. One of our state representatives couldn't get a bed for his son even though he met criteria to be held. A few hours after release, he stabbed his father, but didn't kill him. He did, however, kill himself. This guy is now all over our laws and a lot of things are changing. I credit him for how seriously they take my son's condition & why I have no problems getting my son admitted on involuntary holds. That's a good reminder that I should send him a Thank You letter sometime.
I checked the laws that went into effect for mental health here this past July 1st & there were quite a few of them. The one I liked the most was that they are going to allow alternative people (not the police) to transport people on involuntary holds if it's safe to do so. My son has been transported once in handcuffs & the police were very nice & explained he wasn't under arrest, and he was OK with it, but it would be nice if that didn't have to happen - and probably more convenient for the police department.