Sure, if you make oil prices increase, US oil companies and their shareholders rake in more cash. But it's harmful for the average American because filling up the tank costs a lot more. Then that price hike spreads to everything else that relies on oil (which is pretty much everything) leading to inflation and rising interest rates (already starting to happen, the shielding you mention doesn't seem to be working, which makes sense in a relatively free-market economy). If the situation drags on, unemployment rises due to soaring costs across the board, and the economy goes to hell.
A rise in crude prices might pay off for a small country that lives almost exclusively off it (say, Saudi Arabia, in the hyphotetical case that it could keep exporting as normal) but for the US? I don't think it does. Surely, Europe is more exposed than the US and will suffer even more, but this is not a zero-sum game.
So I don't think it's an elaborate plan, it's just Trump being reckless as usual.