First off breaking or stealing his shit is gonna get you in cuffs not him. Calling the COP's just leads to heat none of you need. One joint laying out from a party 2 months ago and the whole house gets raided. Heat brings heat.
This is the same shit we tell people when they talk about gun control. The guns are not the problem, the human is. Sort out the person and the gun problems solve themselves. If you and your friends are too pussy to sort him out one on one, then a blanket party or a group meeting where you lay it down for him are your only options.
Retards offing and injuring themselves makes great YouTube, but more often than not they hurt folks around them too. Sort him the fuck out or curl you tail between your legs and get away from the inevitable shit storm that comes along with a 20 something losing his vision for life.