The stuff I've read about places that have legalized shows the percentage of "abuse" doesn't change much, so the downstream effects aren't significantly different. I will grant that these studies don't have decades of data, so some scepticism is earned but what we're doing now has all the things you're talking about with a ridiculous amount of senseless violence and more militaristic police.
I just don't think we can keep doing this and expect any difference in results.