Drug abuse can cause a human brain to be fried. That is why a lot of drug addicts doesn't know what they were doing when they are high. It seems that they are in a different world and they thought that they are above the law. In our country, majority of the crimes are committed by a drug addict. It only shows that drugs are a major threat to the society and it should be stop by ANY means.
Well, that's true, solvents could really dry your brain. Not to mention that it's hallucinogenic effect of these drugs. No wonder why some drivers smash their cars into something because they've seen something.
If majority of the crime in your country was done by this drug addicts, I think something is wrong. Probably no one cares about drug addiction, or the government lacks the ability to control it. It is also possible that there is conspiracy that is happening between the government and drug dealers.