I’m from one of those countries, and I can assure you a lot of people would now have preferred that we went with an EU competitor instead.
Countries are buying it because it is the only game in town for certain high-value capabilities, not because they necessarily like the implications of there being a single seller of those capabilities. For better or worse, the US has been flying these for 30 years and has 6th generation aircraft in production. Everyone else is still figuring out their first 5th generation offering.
Closing that gap is a tall order. Either way, European countries need these modern capabilities to have a capable deterrent.
Anyway we're all just crossing our fingers that the US is just temporarily insane and will eventually come to its senses. What else can you do.
You know the answer, but I'll say it anyway. There is no comparable alternative today, and there will not be one in the near future.
How well will the european countries survive with it if the US cuts off access to spare parts, SW maintenance links etc?
Europe is wise and capable enough to develop their own platform.