drugs, law
you'd have to be an absolute fucking fruitloop to believe outlawing drug use will stop itpeople are speeding regardless of traffic regulations, people are pirating stuff in spite of copyright laws, people gamble without concerns about strong bans and people litter despite it being not only illegal, but also not nice to others
but somehow, for some magical reason, if we ban drugs, people won't do them
just one more drug blanket ban, i promise, we never tried that before, we're one blanket ban and one scare campaign away from solving the problem for good