Would you tell your ADULT child if you thought their lifestyle was reckless

My son is 22 and in college. He's in a fraternity and this year he's been telling me about how he gets black out drunk every single night. And I mean black out drunk. To the point he can't recount for 80% of it. Him and his friends and fraternity mates will also just get in random cars with people to go to random parties. They're always going off with anybody and everybody. He told me he woke up on a yacht one night. I know he's an adult but getting black out drunk is very dangerous. Especially if it's every night. If you're going random places with strangers and getting blacked out all the time that sounds pretty reckless. I know I need to respect his boundaries and he's 22. I know it's part of being in college but a lot of bad things can happen 😕

@Casey I never said they were drinking and driving. He mentioned being charged an extra fee for throwing up in an Uber so I assume they use an uber. They do get in random cars with strangers to go to parties or boats which is dangerous. As far as I know he's not drinking and driving.