Is it problematic that older people get off on people that look like kids? Sure, that’s kinda weird. I see kids in college and it amazes me that other people my age are attracted to them. They look like kids to me and I’m not even 10 years out from undergrad.
Is it wrong that the community exists on Lemmy? I don’t think so. It’s legal and you’re not going to eliminate the behavior by getting rid of the community.