"A nation should kill all the citizens who doesn't pay taxes."
Right or wrong?
Depends on what other benefits they provide, and what the benefits/cost of killing them is. If these nonpayers are very small segment of the entire population or you only kill off a small portion of them, you can probably be fine with that, since it might make the rest of them start paying up. However, if they comprise a significant part of the people, you obviously cannot kill all of them without doing serious damage to the national economy. This there is also the issue of popular support; you will need to publicize the incidents to convince others to start paying, but depending on the common social culture, it may not go well with the people.
"Nazi-Germany did the right thing to kill the jews because the the Nazis thought that they were pollution the economysystem"
Right or wrong?
This particular one actually stems from a strange assumption, that the Jews would "pollute" the economy. They would obviously contribute to it just as much as anyone else would, since the fact that they are Jews is not really going to have any effect on their economic importance. So it was wrong for Germany, but only because they could have practically benefitted otherwise (assuming that is what they wanted

).
The thing is that exactly the statement you wrote above is why people around the world are really pissed of at the USA. Sure, the USA are the greatest military power today but we also live in the 21th century. These things that USA does today may have worked 200 years ago and many countries have done it (ex, China, Russia, UK Germany, France etc etc.) but I believe and hope that we have learned fron history that war is not the solution to the problem. But the sad thing is that nutcases like Hitler, Saddam and Bush will keep making this world an unsafe world.
It has nothing to do with the US here actually or this particular period of time; this method is quite inherent in the operation of the state itself, and really for that matter, any such competing parties in the universe. This system has been in effect since the first civilizations started and will go on for as long as independent nations exist at all, and those who "learn from history" are simply going to become more vulnerable to those who do not.
Besides, the Europeans for one have a long history of absolutely brilliant geopolitical maneuvering, and I think it very unlikely that they will all of a sudden have become incompetent; I bet what is really happening here is that they are simply continuing this tradition of genius, disguising their real goals (mentioned earlier in this thread) under high moral principles to gain popular support for their causes.
