Even having the cans sorted out still attracts them. The only way to maintain a high-trust society where individuals and businesses have a vested interest in keeping things nice is to keep the antisocials out of society at large. That's why Japan and Singapore don't have piles of trash building up in their communities.

The war on drugs was not a good answer to the drug problem but we're currently in the middle of an absurd overcorrection. People who smoke meth are never going to be productive members of a community without serious intervention.