Only if legalization led to a vast increase in use, which is highly doubtful. It stands to reason that most people who aren't deterred from using, say, heroin or meth because of the properties of the drugs themselves also aren't deterred by the possibility of jail time. One might anticipate a significant increase in marijuana use - because there the penalty for illegal use is worse than the drug itself - but not nearly enough to "destroy this country."
There are lots of bigger constitutional infringements than drug laws that need to be fixed
Agreed.
before we get to the point of worrying about it.
Why before? Why not in parallel with?
It wouldn't take a vast increase in drug use. We are teetering on the edge of beneficiaries of public largess outnumbering the tax payers in our country. Roll back the welfare state and socialized medicine so I'm not responsible for someone else's lack of responsibility and lets talk about it. That seems like the most logical way to go about it.
"Why before? Why not in parallel with?"
Because at best the government is stupid, at worse is maliciously trying to destroy our nation. We can't give them any excuses to mess up our country more than it already is.