The closer we get to legalization, the more people are talking about it, and the more people are talking about it, the greater the likelihood of hearing bizarre and incoherent viewpoints:

Those in favor also contend that if you remove the black market by making pot consumption legal — much of the marijuana-related crime would automatically go down.

That is where I have to respectfully disagree.

Money is legal, but criminals still rob banks to get it.

The more marijuana there is out there being grown, the more of it there will be to be stolen.

Criminals gravitate to wherever there is anything of value they can steal. [Oakland Tribune]

Excuse me, but what the hell does that have to do with whether or not marijuana should be legal? Yeah, we're all familiar with the fact that people prefer to steal stuff that's worth money. What on earth is your point?

I think the author might actually be arguing that prohibition somehow devalues the marijuana supply, which would have to be the stupidest understanding of drug laws I've ever encountered. So let me respond in very simple terms: marijuana will not be worth as much money when it is legal. Marijuana sales will take place in secure facilities, and thugs will be put out of business, so you'll be less likely to see stories like this in the news:

Police said Arrington was selling marijuana to one of the victims in the back seat of a white Chevrolet Yukon when the two began arguing about the quality of the marijuana. Arrington allegedly pulled out a gun, shot the man with whom he was arguing, then shot two of the man's acquaintances, who were in the front seat. [Washington Post]

That shooting took place a week ago and only a mile from my home, so I take this very seriously. Marijuana laws are a matter of life and death, and anyone who walks around spouting off opinions without thinking is making the problem worse. If we don't want people getting shot over pot deals in the back of SUVs, then we need to put it somewhere safe. We put money in banks, and sometimes they get robbed, but no one ever argues that banks are a dangerous way to store and distribute money.

We don't need to prove that legalization is 100% perfect and invincible in every conceivable way in order to justify our position. We can easily show that it's the safest and best available option. If that's not enough for you, then you're either an obstructionist, an idiot, or both.