Fair enough, and a good point. I only say that for the most part, the West couldn't have prosecuted every Nazi, and made their decisions with their rationale of being rid of the most dangerous threats and moving on to deal with rebuilding, domestic issues, and the Red menace.
Reinefarth and Globke managed to slip through and play the game to their benefit among this. The former was spared as a witness then released, and the latter overlooked due to lack of official party membership and then made useful as a spy against the Soviets. Ideally their crimes would have seen them face trial alongside Rosenberg and Frick, who acted similarly - or sent to Poland and Israel...
Unfortunately pragmatism often finds such a way to conflict with justice... not saying its right, just saying how it happened.
As for their election to politics... democracy sometimes produces such weird results. The USA had a former Exalted Cyclops of the KKK become its longest serving Senator. You wouldn't necessarily expect that either, but people have a short attention span and a large capacity for forgiveness, I guess. (No I'm not saying what Byrd did is as bad as Nazi murder, btw)