Hang on dittany, surely the closures in Amsterdam are a sign that legalisation is working? The fact that they actually know what is going on and have the power to target and close certain joints down specifically because abuse is going on - this is GOOD!
Do we see similar raids going on over here in the UK? No we do not, the police haven't a clue what's going on, and lack the mandate to target abuse specifically (instead they close down places for drug dealing or pimping). Plus criminalisation makes it much harder to give women an escape route, because their illegal status keeps them hidden from those who could help.
Just look at the difference between our laws on smoking and heroin, for example. Smoking is legal but strongly controlled. Over the years, increasing regulation has reduced levels of smoking and made it less and less socially acceptable. Taxes on fags pay for our health service. Everyone understands the risks, because in a controlled environment it is possible to carry out scientific research. It's quite conceivable that some day, smoking will become a thing of the past.
Heroin, on the other hand, is adulterated with substances that cause even more harm, and sold to you by criminals who may draw you into other harmful activities. The profits go into the pockets of people-traffickers, pimps, criminal warlords and the rest. It's hard to treat the illnesses of heavy users, because no-one has a clue what chemicals they've been ingesting and there is hardly any good scientific research. Reaching addicts to treat their addiction is hard too because criminalised addiction forces them underground, keeping them in the hands of the scum who are in complete control of the drugs scene.
I can understand your anger - but these problems have been around a long time, we need less emotion and more new ideas if we have a hope in hell of making the situation better.