If anything, Harvey Weinstein is addicted to sexual abuse and harassment.
Not sex.
While sex is a part of "sexual assault" in more than just the word, it is not what motivates people to rape others; rapists seek power through assault more than anything else. Weinstein abused women because he enjoyed making them uncomfortable, enjoyed the power trip that came with taking advantage of them, and because "when you’re a star, they let you do it. You can do anything." He was wealthy, he was famous, and he very deliberately took advantage of his position of power over young women looking to enter his kingdom: the entertainment industry.
His attempts to blame sex for assault, just as Brock Turner blamed alcohol for rape, are sickening. Unfortunately, though, they're not surprising. Our culture, rape culture, continually makes excuses for rapists, while victims are reminded of how they should have prevented being raped.
Harvey Weinstein should not go to rehab because rehab is a place for people who are addicted to something they cannot control, which typically harms themselves more than others. Even people who are clinically diagnosed as being addicted to sex are not rapists; they understand that their desires do not give them a right over other people's bodies. His "addiction" does not give him permission to violate the rights of other people, just like kleptomaniacs are not forgiven for theft; they are prosecuted.
Weinstein's "addiction" is just another variety of the same sexist justification that men cannot control themselves around women. This sexist joke should not only be rejected for its absurdity (there are plenty of people who have enough self-discipline to not harass women) but also because it is insulting to men. Men have enough self-control to not lose all restraint at the sight of a girl's bra strap, and it should be horribly insulting to them that this was ever questioned, let alone used as a justification for the patriarchal hierarchy that controlled women.
Like the other 99 percent of rapists who will walk away free without seeing a day in prison, Harvey Weinstein deserves to see his day behind bars. Weinstein getting help will not help, and second chances are long gone. He gave himself many, many more chances and only began asking for second chances when the women he harassed had the courage to speak up and unite against him. His choice to harass vulnerable women is always a conscientious decision, and rehab should not take the place of legal and social repercussions.
Although I think rehab is a cop-out and a way to paint himself as a victim of circumstances rather than a misogynistic serial-harasser, I hope it helps. For the sake of all the women he has cornered in hotel rooms, and all the women he still has potential to harass, I hope rehab changes him.
Until then, though, and even if that day comes, I'll be waiting for his day in court.