Which is another security thing, I just didn't include it because I was typing on my phone and running out of time. But yes, Saudi Arabia, Russia, Venezuela, and all the other OPEC countries that your conservative uncle likely has a long history of not liking will lose influence if their oil revenues plummet.

Also, gas goes bad and it can easily become contaminated by something as simple as moisture building up, after which it will damage engines if used. Not to mention that dangers of fire or leaks. The sun won't hit its expiration date for a few billion years, and for the most part the worst thing that can happen with solar is that efficiency goes down slightly if the panel needs cleaning.