There no ligitimit reasoning behind it being illegal. Infact, it is illegal for the government to illegalise it. Damnit.

You cant just go round banning plants.. That no differnt from banning water.

[Is that another bad comparison]

The point im trying to get across, is it rains. You can just ban water, cos you can ban rain. It's natural, and you cant ban a plant growing. It's natural.