Now that we know that the so-called “moderate” Arab states, like Kuwait are not really our friends, and have been funding terrorism for years, why did we even bother when Saddam invaded Kuwait?
For the same reason we sided with the Soviets against the Nazis. This isn't Star Wars, where a monolithic Rebel Coalition goes up against an equally monolithic Empire. The threats to our interests (and the interests of just about any state throughout history) come from not one or two, but literally dozens of countries and alliances. Saddam was the greater of two evils, which is why we restored the emirate of Kuwait. Poland wasn't exactly a paragon of Anglo-Saxon virtues when Germany invaded, but the threat from an enlarged Germany was sufficient to get Britain to declare war.
Note that Britain declared war on Germany, but not the Soviet Union, which had also invaded Poland. It was clear that they considered the Nazis the lesser of two evils and set their diplomatic policy accordingly.