Earlier quoted context omitted.
From my experience talking to the people whose job it is to provide support and services to those who abuse substances. Most experts in substance abuse normally say Alcohol is the worst of all the substances. With many stating, it causes more havoc in families on scale than heroin. More people die because of Alcohol, not just from drinking it but from drink drivers, drunken fights, etc. The general violence caused by…
But note that all those statement are about the amount of harm in an environment where alcohol is legal, cheaply available in every supermarket, widely advertized, and its consumption socially accepted, even expected . Can you really say in good conscience that other drugs wouldn't be worse if they became equally ubiquitous?
I'm sure that in general people on weed, shrooms, DMT or MDMA are much much less prone to violent aggression and destructive behaviour than drunk people. I'm also sure all of these but the last do much less (if any) harm to your health than alcohol does.
The only drugs I know which can be considered as or more dangerous than alcohol are opioids (except kratom - it's considered opioid but is harmless unless you consume huge amounts regularly for too long), cocaine (if taken chronically), meth (if abused, can change life for good if used properly to treat severe ADHD cases) and bromo-dragonfly. LSD probably is dangerous for people who are borderline crazy - psychos may become more violent after taking it.