The war on drugs is a complete waste of the U.S. government's energy and time. Unfortunately they are making more money off of the illegal trafficking of drugs than they would if it was legalized. Yes, there is mass corruption in many countries governments and they do control imports and exports of illegal drugs. This leads to people who seek to purchase these drugs entering into dangerous situations that would not exist were most drugs legal and regulated, as well as unfortunate situations and deaths from the misuse of these drugs. Again, if they were legal and regulated there would be much more education about them.
I think that status of drugs is absolutely absurd. People will get drugs that are illegal if they want to either way. There will always be people who abuse drugs, it makes no sense to focus on that specific group as a reason for outlawing drugs in general. We as a culture would immensely benefit from the legalization and research of the current illegal drugs. There's a lot of rich corrupt people out there that would not benefit from that, however... and that is the main reason why the drug status is the way it is now.
I'll end with a quote from one of my favorite people in life (relating back to what I said about drug abuse):
"People say 'well you can abuse marijuana'. Well shit, you can abuse cheeseburgers too you know. You don't go around closing Burger King because you could abuse something. I can take a ****in fork and jam it in my eyeball, does that mean forks should be illegal? I can jump off a bridge, should we outlaw bridges? Let's nerf the world!" -Joe Rogan