It's like saying the CIA wasn't trying to destroy communities when they were handing out crack, because "moral people wouldn't have taken it". Every single person building these platforms knew how addictive they were. It was the entire reason these companies were valued from the start. It was the end goal.
Yeah, a junkie can decide not to go find another needle. But if that is your response to the drug epidemic, you then have marginalized people who you've decreed "not worth saving". And I don't like what that has looked like over the last 60 years.