"And making them legal would just make drugs easier to get(not that they are hard to get already)."
Not necessarily. That depends mostly on the way in which legalization were enacted. If the government had a heavy role, it could make drugs quite difficult to get a hold of. For example, it's much, much easier for me to buy cocaine than it is for me to buy Percocet. I'd need a prescription or someone who has a prescription. Doctors would prescribe it to me because I'm clearly not in need of it's therapeutic effects, and the person with the prescription usually does and isn't very willing to sell it. At the very least, if drugs were dealt with in a similar way as alcohol and tobacco we might see a decrease in exposure to children.
"Drugs dont do good in society."
Define drug. People make all sorts of arbitrary distinctions between different substances... I would say that caffeine (which *is* a drug) has probably done good in society, in a sense. With all the people who rely on it to boost themselves in the mornings... if we banned caffeine the North American economy would completely shut down. Caffeine is a great example because it's actually very addictive (the only drug with which I've ever experienced withdrawal), and is similar in chemical function to amphetamines as well as exhibiting similar overdose symptoms in both cases.
The most striking difference is perhaps that caffeine is found much more commonly in plants as a natural pesticide while many chemically similar substances were synthetically produced in the past century. If meth naturally occurred in tulips at concentrations far below the yield of artificial synthesis, I bet we'd have tulip tea, and there'd be Speedbucks on every corner selling Methmochas. It's the difference in dosage; you'd easily die of overdose if you snorted a line of relatively pure caffeine.
"and von moricke that's ridiculous to say alcohol is the most dangerous thing. Obviously it's harmful when you get plastered but no one can sustain that at a constant rate. Cigarettes kill you in the long term but they don't impede performance. Hard drugs really screw you up and often don't take long to have an effect unlike alcohol."
Actually, alcohol is quite a harmful drug, relatively speaking (not that I don't drink). It's physically quite toxic, to the point that alcohol poisoning is a pretty common occurrence. Comparably, to die of caffeine you'd have to drink like 80 cups of coffee, or with magic mushrooms you'd have to eat 17 kg of fresh mushrooms, and I've heard an estimate of having to smoke 680 kg of marijuana in 14 minutes to conceivably overdose from THC. More importantly, the dose required for recreational effects of these substances is astronomically lower than the dose required for lethal effects, whereas with alcohol, the ratio is much smaller.
In the short term, alcohol impairs judgement and dramatically affects your co-ordination, balance, reaction times, etc not to mention damage to your central nervous system, most notably in centres critical for learning and memory. In the long term, it increases risk for cardiovascular disease, liver disease, mental illness, and a host of other fun things.These are just the direct effects of alcohol. Driving under the influence causes many deaths, injuries, and property damage. Nobody beats their wife when they're high. Nobody gets into fights when they're on MDMA. Alcohol may be single greatest instigator of riots.
"we have at least reduced the usage"
TGM already brought up Portugal, but it's also worth bringing up the case of marijuana legalization in the Netherlands. Amongst the youth, marijuana consumption has actually gone down. I've heard it said that they've succeeded in making pot "boring".