What is happening in Venezuela is perfectly fine by me. I also think it was primarily for the oil but hey, if we can wack those drug fuckers while we're at it, by all means, wack away. 
The way I see it, better the US is at the reins as far as Venezuelan oil than China, Russia, and whoever else who would like the US to burn to the ground.
My personal take on the drug war: Wack away at those drug pushing pukes but an equal amount of effort and resources should be spent on destroying the demand for it.
That being said, I think destroying the demand for drugs is harder. I don't even have a clue as to where to start. But I think the answer lies somewhere in the deterioration of our society.
And in my opinion you can blame the damn demorats for that.
it's difficult to stop the demand when the supply makes it very lucrative for the sellers. You would think incarceration would thwart the demand, yet there are guards and inmates able to have a successful career supplying drugs to inmates. if it's available, the addicts will seek it out.
There's been much study done on addictions. One theory is that many of us have addictive personalities. It all depends on what catches our attention first that become the obsession. Workaholics are addicted to the money, status and feeling that working harder and longer hours than anyone else obtains. Some are addicted to gambling, which is partly the risk but also just playing the game. Winning is the high they seek. Runners can get addicted to the euphoric feeling created when they "hit the wall" and dopamine is released into the brain. There are sex/porn addicts, video gaming addicts, and so on. Many addictions are linked to vices and are by definition activities that provide pleasure. Smoking is considered a vice, and it is one of the most addictive behaviors we know of.
Until there's a way to control addictions in the human body -- both physical and psychological -- there will always be a demand for illegal drugs, prostitution, gambling, .....