Comment by cm2187

I don't think the concern is that they would turn hostile to the US, but rather that they would need to strike a country that for one reason or another, the US doesn't want them to strike (though of course you also have to weight the risk of a coup and of a hostile regime coming to power into a formerly friendly country).

Fictitious scenarios: let's say the US sells F35 to Taiwan. China tries to invade Taiwan. Taiwan wants to use the F35 to fight Chinese forces. China makes a deal with the US to limit the economic impact on the US of the invasion of Taiwan, and the US president of the time thinks maintaining a good trade relationship with China is more important than Taiwan remaining an independent democracy, and will therefore curb Taiwan's ability to use those F35. Not completely far fetched. Doesn't mean Taiwan has gone rogue.

The US tries to keep good relationship with Pakistan, while at the same time considering selling some weapons to India. You can imagine why India would prefer the older French Rafale (the French are much less demanding about what you do with their weapons, though there is the precedent of helping the UK with the Exocet it sold to Argentina during the Falklands war). The middle east is also full of those complex relationships.