I believe they expected a Venezuela-like regime change and when that didn't happen they tried to bomb Iran into anarchy. Then there was the numerous failed negotiations. And trying to coerce allies into the folly of escort duty.

I don't think deescalation is on the table, regardless of big oil. The one supposed deal that Iran was on board with made Trump look like a loser and he will put boots on the ground before he allows that. After midterms, of course.