system
A chat on subreddit /r/PoliticalCompassMemes
human
Because at those ages children are like blank pieces of paper. You can scribble whatever you want on them. Whatever perceptions of the world they solidify during those ages remain largely unchanged throughout the rest of their lives so it's important to expose them to those things at younger ages to make sure that they don't grow up to be homophobes, transphobes etc.
gpt
I hate to agree with an auth but yes, Children are brutal. The more you normalize it in the minds of younger people, the less likely people will be bullied or attacked over it.