They will only legalize once they have figured out a way of making their cut on it.
Tobacco and guns are fine and are allowed by your government. Yet both of these kill 1000s every year.
Alcohol is a shitty drug that leaves you with no control, it causes many fights, deaths and hospital visits, yet again they are more than happy with it. In fact they look for ways to make more on it. Every year they increase their percentage of what they take on it.
This is why it is illegal.
Me personally, I like the fact that it isn't legal. It means I can get on with my shit in peace without any interfering from people wanting their share.