Tbh this topic doesn't even belong here, on a forum, for a game designed for tween year olds.
Out of all the places to post this why on the Blockland Forums? Lol
Technically the game isn't designed for any particular age group. It's just a sandbox game, the fact that a younger crowd is attracted to this game is irrelevant to design.
Regardless, it doesn't matter. There are people on this forum that aren't tweens, and we need places to go and talk about non-tween stuff. There's worse stuff here: special interest threads, furry threads, semi-nudity (hot [anime] girls) threads, etc. Just because most people aren't in the right age group for something doesn't mean none of us are. The OP even says don't do drugs before you're 18.