Energy independence would upend a lot of international trade markets and therefore geopolitical stability in some areas. If you don't need Saudi Arabia for oil, why do you care what happens there?
The USA is already largely energy independent. We import very little oil from Saudi Arabia. But if the price of fusion power gets low enough (questionable) then that would obviously have a huge impact on international trade.
It is in the interest of global stability that we absolutely decimate Saudi Arabia, as well as Russia. Other oil producing nations suck too, but they mostly suck internally, whereas KSA and Russia are oil-funded international terrorist regimes.
