Thoughts on sliding challenges from younger age groups.

What are other coaches thoughts on this. Last weekend I watched 2 kids get their legs broken by silly sliding tackes. It was horrible. The offenders didn't do it on purpose, but they were clumsy and reckless. On my U10 team I have a zero sliding rule, except for keepers. I always thought about approaching the league about a ban on sliding until u12, but i didn't want to be that guy.

Just would like to hear some opinions on this matter.