Honestly, if you want my advice. Let it go. It's really not worth it. It ain't no thang . It is in the rules. I don't want to step on you or anyone else's toes, but I've seen quite a few people get a temp or perm ban for talking about it.
I don't see anyone creating threads discussing speeding. And yes, Weed IS illegal. Except in very rare cases.
But all of this doesn't matter when you consider the fact that this isn't your website, and there are rules all of us have to follow. One of those rules is that you can't talk about illegal substances, one of these substances happens to be pot. There doesn't have to be a reason that you consider "good enough". Hell, there doesn't have to be a reason at all.
If you want to talk about pot, go talk about it somewhere else. Period. End of story.
If you insist on discussing it on my wall, which is a public section of the board, I'm going to infract you. Consider this a warning.