Now with that said, crack, meth and heroin are not "social drugs" and are not compatible with a healthy society. They are strongly addictive and cause permanent damage. You might disagree (and that's fine), but I don't see how making those legally available outside of addiction treatment facility will lead to favourable societal outcomes in any meaningful way.
Honestly, I don't think anyone can seriously claim it is anywhere near as bad as alcohol, other than in two regards: smoking isn't great for you (but that's a method problem, not a substance one) and the smell in public (which is a minor issue and, again, one that can be mitigated).
By any other measure - addiction, short-term and long-term harms, indirect harm to third-parties - alcohol is worse.
What makes you think that drug use has anything much to do at all with drug policy? People take drugs because society is shit, not because of the rule of law.
Society also becomes shit because people take drugs.
On a related tangent, Heroin is actually a former trademark. Not a lapsed one, but one that was specifically revoked to punish Bayer during the war. Aspirin was another one. And that's why you see generic "aspirin" but no generic explicitly marketed as "xerox" or "kleenex." The kleenex mark is weakened, but not dead like aspirin and heroin.
As an uncontroversial example, maybe someone is well qualified to manipulate explosives in their garage. But society would still say the risk is not worth it, because by the time the “nuisance” is dealt with, there would be unacceptable losses.
The relevant measures to be discussed are what is the probability of someone using PCP and not being a nuisance, and if they did use PCP, what severity would the nuisance be?
The problem is that taking pcp significantly raises the probability the user will commit an act of violence, by which point it’s too late.
A little thing called democracy. Perhaps you've heard of it.