Why will increased use of military drones by larger countries on earth tend to create failed states?

Drones of all kinds used by the militaries of the world more and more are going to be a relatively anonymous way of killing people because they can choose where and when on a deserted road somewhere at night. So, anyone who knows anything that some government on earth ( a good or bad government or anywhere in between) can kill someone for example, (because a world leader found out he or she is having an affair with a spouse or because of their race or political view). So, someone can be killed anonymously anywhere on earth at any time first by governments and then by rich companies or individuals anytime anywhere. Since this is relatively anonymous with no witnesses generally speaking this type of thing won't be able to be proved by police anywhere. They will only know something happened.

So, this will begin to greatly reduce populations over time all over the earth. And this likely will cause more and more failed nation states in the poorer 50% of the world where there are more likely to be extremely corrupt governments that might resemble Mafia Gangs ruling countries. This will happen from large drones to the very smallest.