You probably have some that are angry at the world that they haven't been given absolutely everything so as an F you to the older gen they're laughing about it. Those just under my age group hate working and they hate they aren't given housing. Different topic but I get a kick looking at social media posts from this gen regarding housing, they are very angry about. My answer is get a job and work hard but they prefer to believe the older generation has screwed everything up for them and it's easier to complain about that.
The others are just kids in their early 20's not stressing anything. You got something out there that if they catch might make them sick but they likely will be better in 5,6,7 days similar to many other bugs we catch. Tough to tell that group to stay locked up and not party or see their friends. Risk/reward is working out in their favor with limited risk being presented to that age group. I'm not mad at them...I would've done the same crap 10-15 years ago.