The thing is, the wrestlers sign the contracts that specifically state these things will happen if they violate the wellness policy. The onus is entirely on them to make sure they follow the rules and don't get caught. I'm not saying they shouldn't be allowed to do drugs, but if they sign a binding agreement not to, then why should I fault WWE when these guys are suspended for getting caught?
The wellness policy is part and parcel of being as big a company as they are. With shareholders and investors, you can ill afford to look like you're enabling athletes. It's not good for business, and the bottom line is that's all WWE cares about with the policy in the first place. There's another thing to take into consideration that most people seem to leave behind when talking about wellness (and TV PG as well). Linda McMahon has desperately been trying to get a Senate seat for years, and the only shot she's ever going to have is if she can convince people that wrestling is no longer a "dirty business", which is why things like wellness and PG exist in the first place.