He's trying to control the oil that goes to China. First, take Maduro then close the Straight of Hormuz (to prevent oil going to China). The rest is just collateral damage as far as he's concerned.

This is all about keeping China down, and preserving American Hegemony. That's his definition of "making America great again". He doesn't care that you're paying more for food, gasoline, etc. and that the rest of the third world will soon be starving.

Gulf States get a swap line (can't let Wall St crash), but you get no bail out because the elites don't care that you are hurting. They care about the Gulf States hurting because that ultimately means Wall St will crash which would hurt the Billionaire elites.

So to sum up, the reason is maintain America's Hegemony and protect the Billionaire class.