All those are really good questions. And I don't know answers for them.
First of all, I wouldn't trust any country with nuclear weapons and the means to deliver them. I also wouldn't trust the two Bushes, or anyone else who represents the interests of the Oil Industry. And I'd be very careful in trusting any Middle East country, especially Israel and Saudi Arabia.
But we cannot afford to walk away from the Middle East, as Trump has begun to do, because it opens the door to much worse actors, Russia.
The only country with useful knowledge of Afghanistan, Iraq, and Iran is the UK. But their present Prime Minister, BJ, is the wrong guy to ask. All through the 19th century, the British had to defend their lucrative colony in India from the Russians. Imperial Russia was expanding throughout Asia, both to the east and the south. They wanted to control harbors that were open to oceans year round. St. Petersburg was in the easily closed off Baltic Sea, and Murmansk, facing the Arctic Ocean was frozen much of the year. They didn't mind if they took India from the British in the process.
So for years, the British and Russians prodded and probed, facing off in Afghanistan and the surrounding areas. At first, the British tried direct military occupation of Afghanistan.
That failed in 1842 when the retreating British suffered a bloody massacre. By the 1870s the British were back in Afghanistan, but were much smarter. To make a long story short, instead of direct confrontation, they bought the loyalty of the Afghans, and armed them to make sure the Russians suffered as bad as the British had 30 years earlier. When the USSR tried to go back to Afghanistan in 1979, they had forgotten what a bad time they had decades earlier. And when the US went there in 2001, D!ck & Bush deliberately ignored all British efforts to share their knowledge & experiences, gained they hard way, all through the 19th century.