How come answerers always give answers irrelevant to the question.?

Everytime I see a question about someone asking how to roll a blunt, or how to grow weed, or what's the best way to smoke weed, people just totally go off topic and say **** like "dude drugs r bad for u!!" and **** like that, don't you think we KNOW that? Weed ain't even bad, you gain more then you lose, and you don't even lose anything! So why do people insist on being a samaritan and try to be our life-coach,