I’ll offer this as a possible reason: Kids don’t solo travel like they used to. Kids not wanting driver’s licenses as much is a thing.

I think I can speak for older generations a little - we couldn’t wait to get enough independence to have a bike or driver’s license to get out of the house. There was only the telephone to talk to people - as in no internet, no social media, not everyone had computer games or consoles. Eventually you had messaging services like AIM or IRC, but you didn’t really meet up with friends on them because not everyone had PCs, or cared to learn how to use one. There was cable TV if you were lucky, but you didn’t watch that all day. We went from one friend’s house to another, or friends of friend’s homes. You got exposed to a lot more living conditions, often while completely unsupervised. Bored kids or kids with home problems didn’t mind pilfering the alcohol from the parents, or got whatever drug they could. Usually pot. Nothing else to do. Plus some peer pressure.

Now? Kids text. They meet up online on discord or whatever VoIP or messaging service is cool right now. Group chats. Play online games. They don’t need to leave the house to hang out, and in-person hangouts seem way less important to my kids than it ever was to me when I was younger. That’s a lot less opportunity to be introduced to alcohol or other drugs and have the access to them.

So maybe less peer pressure isn’t necessarily a Covid result, it’s the result of social interaction moving to online spaces and not physical spaces where access to alcohol or other drugs are present.