Should we take this guys opinion seriously? That's what I thought too.
No need for that comment in pointing out the flaws in Zerox's argument. What's the point in communicating that? To end the argument because you think the premises are invalid? You can say that in a less pejorative manner.
Here's my opinion about legalizing marijuana. One could say that the objectively correct endeavor is to stop the use of harmful drugs. Many people say marijuana isn't harmful, but it is proven to be harmful in the long term, has emotional effects in the short term, and is a gateway to unhealthy lifestyles and worse drugs. By legalizing marijuana, we may decrease the popularity of the drug, but it will put our progress of reducing the drug-taking population in a stasis, because there is no way to enforce drug prohibition. We'll get the number of people who take drugs down to a certain number, but that number will remain static. One may argue that we educate people instead of enforce by law, but we do that already and it doesn't work. One may also say that if marijuana were legal, discussions in school would be more open and productive. I think that the effects of marketing will outweigh this benefit.
Furthermore, the argument that legalizing marijuana will decrease its popularity is only speculative. You have to take marketing into play. Also, the government will most likely tax marijuana, else the marijuana industry would become the next Microsoft. Or maybe Microsoft will become a marijuana industry. Anyways, we're adding another Sin Tax to our profile, and America already has enough attributes to be ashamed about.