You get involved where they are gong to affect our own national interests. Saddam Hussein’s interest there was to control an overwhelming amount of the world’s oil so that he could blackmail the West (that would be the USA).
It was in the national interests and security interests of the USA to kick Saddam Hussein out of Kuwait. However, he should have been left in better control over his own country to prevent the situation that has developed today.
That would ALSO be in our national interest.
The Saudis have blackmailed the West for years, but they do it with a smile.
That's conjecture. We know the Kuwaitis and the Saudi agents went full stop with the propaganda to get us into that war.
Now granted, if you go to war with someone, you damn well don't keep them in power, or else you can bet they will make trouble again. And sure enough, we had to go back in 10 years later.