People have dark sides, like addiction, greed etc. Tools are just that, tools. The side effects you mention are only certain people predispositioned towards such conditions. Now if you are really worried about side-effects of any drug then read the little multifolder bit of paper in prescription drugs, they list almost everything upto and including death.
If somebody say died from alcohol over use would alcohol be bad or whould it be the person, really is that simple. Same with guns and other things that can be used, as tools of good or destruction.
I find it crazy to ban something to protect the ignorant against there own shortcommings at the expense of the benifits it brings others.
People have died from drinking too much water, shoudl that be banned and have a warning lable, people do stupid things, dome good some dark.
So no drug or tool has a dark side, it is just an excuse people use to cover up there mistakes and explain the mistakes of others. Though easily confused in todays meme news events.