Even if he’s known to be mentally ill, his ideas can still stand. Take Ted Kaczynski for example. His actions were inexcusable but his ideas and writings on technology and its relationship to society have value.
Do you think Kanye's claims that Hollywood Jews have placed child actors in his home to sexualize his children will stand the test of time and be shown to have value?
Whether or not some or all of Kanye's claims are the most ridiculous things, cherry-picking and presenting one piece of bait and trying to associate everything Kanye has ever said with the same brush feels like a hell of a disingenuous way to argue. You can't just dismiss everything somebody said just because they were very wrong other stuff.
PS: I'm not going to say what's true or false about any of Kanye's claims here, but who the hell knows what goes on in the highest levels of Hollywood? This is a circle of people who felt zero shame publicly disparaging critics of Roman Polanski. And apparently the Harvey Weinstein stuff was common knowledge in Hollywood crowds for decades. If you think Kanye has little credibility, well, think about how Hollywood's credibility ought to be perceived.