That's because alcohol isn't a hard drug. You can't even compare alcohol and the damage that hardcore drugs do. There is no comparison.
It takes an ounce of responsibility and a given individual can drink alcohol with hardly any repercussions. The biggest danger involving alcohol is guys that don't make a plan to get back home and then they drink and drive. A strong hangover is enough consequence to prevent most people from binge drinking.
Name one way that someone can responsibly do meth. Name one way that someone can responsibly do acid. Name one way that someone can responsibly do coke.
You can't.
The article doesn't even accurately reflect the study. The article was just CNN's interpretation. The study that was preformed rated the substances on a scale of how much "substance a" affects yourself, your family, etc...
The study went on to say that alcohol will affect others negatively more so than other drugs (which is also bullshit). The physical damage of other substances don't compare.
Lastly, alcohol is regulated by the government and manufacturers. Drugs are not. When dealers get product from the supplier, they "step on it" so that they can turn a larger profit. Stepping on it basically means that they add their own shit, whatever it may be in order to increase the amount of whatever they are selling so that they can sell more of it. That's one of the main reasons why people overdose; chemicals and synthetics are being added to a formula that already includes sketchy shit.
As far as addiction goes, there is also no comparison. No alcoholic is going to go to the ghetto and suck dick or get fucked in the ass by another man for alcohol.
Ask any cop. It happens every day.