Hobbezak
Garden Designer
Considering that alcohol, a legalised substance, is causing more damage to British economy (in volume of crimes it creates and the cost of damages associated with it) - I can't see how the legalisation of hard drugs would do anything but worsen society.
Take a drive through any big town or city on a weekend (and most weekdays too, now), hang around for a while, and you'll witness en-masse the effects of legalised alcohol on society.
Now imagine all these binge-drinking alcohol drinkers are also on even more physically damaging substances that can cause an even greater loss of control (and in some drugs increase of aggression, paranoia etc.) - and that access to very addictive substances is available to anyone to get hooked on to the point of needing it, and what they will do when they can't afford more but are physically addicted (either costing our health service to get them off the drugs, or cost in crimes committed to fund the drugs)....
No, it's ridiculous.
The evidence of a legalised substance is visible for all: Alcohol. The thought of all of our streets and pubs drunken population also being fuelled by heroin, crack cocaine, crystal meth... or staggering around the streets hallucinating on acid as they try to make their way home at closing time... it's not a happy world.
Consider these people you say are misbehaving because of alcohol. Say they didn't use alcohol. You think they wouldn't commit crime anymore?
It's still the people who commit crimes, but I'm more than interested to see some data that proves your statement that there is a serious causal relation between alcohol and crime. Because I'm inclined to believe that even if some people weren't using alcohol, they'd still commit crimes.