I fear that, unfortunately, a liberal approach to drugs will not end well at all. And I have thought a lot about this and heard all the arguments in favour. And yes, I know about how alcohol is legal and much worse than mj.
But suppose there was a drug even "better" than mj, legal, cheap, very available and had no side effects whatsoever. Suppose it was not addictive, just THE most pleasant thing you could do in your spare time. How would the society be affected by replacement of a complex system of drives and desires with one simple desire, to get high on this new drug whenever possible?
I fear we'd be facign the ultimate Tragedy of the Commons.
Novelty-seeking is a great pleasure for much of the population. Something can't be both non-addictive and also the most pleasant thing to do all the time.
We would have to breed out or genetically engineer out the possibility of boredom, which we're not going to do. Or if we do, then that's the source of the problem, not the drugs.
Instead of that, how about actually listing points as to why it could be bad instead of just say 'it will not end well'