Irrelevant and immaterial. According to your logic, it is wrong to legalize something as long as people who don't want to pay for it might still steal it.
Regards,
Recreational drugs of any kind shouldn't be legalized, because like gay marriage, it then opens up the way for liberals to take it even farther. They like to introduce perversion and aberrant behavior, piece by piece, and they've been allowed to get away with it.