Stealing is just part of the everyday equation of a doper.
The less he spends the less he steals.
What about the increase in unemployment? The higher welfare roles? Already Colorado has seen an increase in the homeless population.
That's a relocation, not an absolute increase. People who have been responsible enough to avoid drug use because it was illegal will continue to be responsible and not let legal drug use drive them out of employment or onto welfare rolls.
This is a statement that deliberately ignores the effect of legitimacy on human nature. The law is a normalizing force. If the law declares something wrong, it dissuades a significant portion of the people from doing it.
This statement also flies in the face of History. When drugs are legalized, drug usage increases following a logistical growth pattern. Like this one: