He's not "out of his mind."

He's deeply inside of it. An entire industry exists to ascribe to mental illness what is more readily explained as him just being a shit human being.

He's been "losing it" for a decade.

Maybe he never had it? Maybe you're still chasing the tail of this story, you think?

Maybe the answer was somewhere back at how he treated the Central Park Five, rather than trying to figure out what new malady might explain his being an insufferable fuckwart.