According to Corey Feldman at least, he was always crazy and immoral.

Type "corey haim corey feldman charlie sheen" into a search

Don't really want to believe it, but Feldman had been talking about the problem in Hollywood for years, and well before Weinstein, without naming names. Feldman and Haim are/were definitely unstable themselves, but many people who had been in that situation would be.