I think you meant "Lebensraum" Amos. I would understand "Liebensraum" as the space you would need to do something more discreet...
The usual point at which we feel obliged to confront dictators is when they cross there borders. If we relax this restraint, we shall have to go to war with China, most of South East Asia, most of Africa and several countries in South America. I agreed with the first Gulf War. It was not - as the sloganists pouted "Blood for Oil". It was about the dangerous power Saddam would have possessed had he got his hands on Saudi Arabia's oil. ( I regard the House of Saud as a shower of loathsome dictators too - but they do not threaten us in the same way as an over powerful Saddam). In short, Saddam does not have the means to pose a real threat to us. He will probably be capable of causing injury and damage on a smaller scale, but that does not threaten our security any more than a variety of potential terrorist adversaries. That really does not compare with Hitler at all. Many historians believe that had France gone to war in September 1939 - instead of just declaring it - Hitler would probably have been doomed much earlier. There is no lack of willingness to confront Saddam if he forgets where Iraq's borders end. It is only at that point that military action against him is justified. The Hitler analogy is worth exploring, because Saddam is as egocentric and vindictive for sure. It breaks down though, because he is nowhere near as powerful.