So are cigarettes.
But it's legal to sell them, and I don't see people up in arms about milkbars, servos, pubs, newsagents, and supermarkets selling cigarettes to mothers and fathers who aren't smart enough to give a shit about the risk of cancer and death, yet people get quite upset about pokies and how they ruin families.
Idiots have always, and will always find ways to throw away their money, and in the case of cigarettes they're often throwing their life away too.