Our survival was not at risk.
True, but does it really help our cause? In the last 8 years anti-americanism world-wide exploded, and not surprisingly it happened when we started doing morally questionable things (openly). We won't be at the top forever, and it's important to realize this so that when we aren't we are not alone and friendless.
Germany, on the other, got an example made of itself by the rest of the world.
And that was something they didn't expect to happen. They went into world war one with the premier army, the largest economy in europe, and a growing naval armada. They expected the war to be quick and mostly painless, to give the French and the Russians a good bashing (again), and it didn't turn out that way, instead it turned into a meat grinder for both sides.
And if we hadn't we would have pissed off Iraq instead. Nature of the beast.
I somehow doubt that Iraq would have turned fundie and gone rogue on us. What happened with Iran was blowback from our meddling, plain and simple.