As someone who has lived with a mentally unstable person, and had to see the shit show that is the mental health system in the US, there isn't a whole lot that a person can do to force another person into treatment/therapy. If they aren't doing anything criminal, or immediately harmful to themselves or others. If Kanye doesn't WANT to go to therapy, aside from him doing something like whipping his dick out at his presidential party, and declaring the first person to suck him off gets to be his VP, AND also go to heaven with GEEEEZUSUH! , we're pretty much stuck with him ranting like a fucking loon. And there is very little legal recourse for the family. Given how nuts he is, I am confident that Kim, and the rest of the family, who definitely seem to me, to be people with their heads on straight, and capable of reason and understanding unstable behavior, have tried multiple times to get Kanye to go to treatment, hence why he's said she tried to lock him up. To HIM, yeah that's what it seems like, because he's irrational, and people with irrational minds, don't process things rationally. So to HIM, it's them trying to cart him off! When the reality is probably more along the lines of "Kanye, you're behaving crazy, scaring us, embarrassing yourself every time you go out in public, I think you should see a doctor about some therapy and/or medication."
But Kanye doesn't think anything's wrong with him, he's just juiced on Jesus Juice and his own inflated ego, and he thinks there is nothing wrong with that.