Do you really feel that "legalising" addictive and physical-dependence-causing "cocaine" will lead to a lesser burden on the collective society than the situation now? if so, then perhaps you need to go visit a rehab centre and see the devastating effect that any "abused" substance can cause -- irrespective of whether it is legal or not.
More importantly, there are enough humans suffering from natural diseases and disasters that could use help, than the few humans who are deliberately indulging in dangerous behaviour and be better dead than sucking precious resources away from those who are trying to merely survive, leave alone "lawyering" and "regulating" cocaine in their lives.
"Liberty" without "responsibility" is the definition "entitlement". Typically seen in individuals and societies too affluent for their own good.