Your judgemental attitude is definitely a part of the problem because while you may be 'accepting' others that share your actual opinion aren't. Do you also think people that take anxiety medication are wasting their life? People that take sleep medication? People that take ADD medication? People that take pain medication? People that have a drink after work to relax? People that drink socially to have a good time?
Equating recreational drugs with medication is misleading; with psychiatric drugs, dangerously so.
Branding recreation and leisure as wasted life, meanwhile, is small minded. Particularly when it comes to something so thoroughly encapsulated by even the most conservative risk envelope.
Saying this as someone who doesn't particularly care for weed.