Are you prepared to rely on foreign governments protecting your interests? And what happens if those countries you mentioned adopt the same mindset?
The UK has a significantly smaller defence budget than the USA does. Which kinda proves my point.
Elsewhere the UK assists the US in Syria and Afghanistan. It's not the other way around.
But feel free to tell me how great the american way of doing things is. What with fantastic provision of basic healthcare for its citizens, and sensible gun control oh yes and affordable education.
Look at Crimea if you want an example of what can happen if there's no force that can back you up.