A friend of mine raised the point the other day that, aside from all other arguments about harm, crime, damned annoying stoners and so on, legalised weed makes a huge amount of money, and with the state struggling to pay for essential services, healthcare and education, even if the worst is true about weed, it is probably the lesser of two evils.
That said, I can't ever see it being legalised in Ireland. At least, not in the next few decades. It'll be a toss-up between it and gay marriage to see which one's opponents die away first!