By legalising drugs we can, licence farmers or government created drug companies(to keep all the profit in the publics hands), create safer drugs, stop the need to create new utterly unsafe "new" designer drugs where chemists are randomly tagging on stuff to an old drug to make it new and legal for a while without knowing ANY of the side effects.
We can LIMIT the amount people can get making bad drug addiction almost impossible.
Lets say person X wants to try drugs in the UK today, its incredibly easy to get drugs and they cost too much, and for many kids the allure of something being illegal only makes them want to try it more.
You aren't taught that 0.2grams is relatively safe but 1gram will kill you, so kid X goes out, buys 2 grams of something or other, snorts/injects it, od's, gets himself addicated or does it in an unsafe enviroment and ends up off his face blacked out and walks into traffic.
Now, lets say that drug is legal, we teach kids about SAFE usage in school, he can get this LEGALLY for 1/100th of the cost at the local chemist, he can only buy a small dose thats a safe amount, he tries it, he doesn't hide it from his parents because its not illegal, he tries it, he likes it, or maybe hates it, he doesn't get addicted as he's not allowed to buy another dose for two weeks and it was a very low dose anyway.
Now the profits from the drug sales end up paying for schools, or healthcare, or policing.
Now please tell me why legalising drugs would be bad?
For the record I don't like drugs, at all, I HAVE to take codeine for mindsplitting migraines and I HATE how I feel on them and they are weak source, I've had some oxycodone level stuff and mophine both in hospital and they are even worse. I've smoked weed, don't like it. I've drunk alcohol and I like it, so with legalised drugs my drug of choice would STILL be alcohol, and right now I can drink myself to death legally any time I want.
People have had this anti-drug stuff pumped into them for 50 years, and its literally all rubbish, this idea that every single person would do drugs 24-7 given the chance, rubbish, the idea that everyone would get addicted, rubbish.
The fact is legalisation would lead to HEAVY regulation, much LOWER usage than is currently undertaken with basically NONE of the MASSIVE LEVELS OF CRIME in this country that surround the drug trade.
The laughable thing is we started the war on drugs and its cost the USA/UK BILLIONS, well TRILLIONS of dollars over 50 years and the drug trade continues to get more profitable year on year, with usage basically the same it ever was, with less safe drugs, more fake drugs, more kids taking drugs mixed with insanely dangerous other substances without knowing and more and more crime.
Gang culture essentially grew out of the drugs trade, we'd have gangs without them, but its one of the main sources of income for gangs that keeps them growing and making more money.
Unfortunately its not cut and dry, kill the drugs trade in only a few months but legalising it, you'll have lots of gangs commiting other crimes, but you'll also have less growth in gangs and eventual drop off in numbers joining gangs.
Drugs really aren't bad, anyone who says so quite literally has incapable of seeing past the "drugs are bad" messages we've had thrown at us for DECADES.
Of all the people I know who are regular users I only know one who got "bad", I've known more non drug users who were perfectly nice and "normal" who have ended up in worse situations. Plenty of people who use drugs would simply have become criminals or ended up in jail, doing daft crap without drugs, thats just how life is.