We'd have cheaper energy than we do today, and cheaper energy forever. We could have been looking at current levels of climate change, instead of the far far bigger changes that we are now going to experience.
And why did we spend so much on these countries? It all comes back to oil and the fear of losing access to oil to power the economy.
We really should never forgive those who work for the fossil fuel industry for putting us on this timeline with their active deceipt, lies, and massive propaganda campaign. There should be no forgiveness for what they have cost us.