Kidnapped Americans have much worse outcomes on average than other country citizens.

This is because the US makes it illegal for families to pay ransoms.

As with most things international, not being American is an asset in such a situation.

https://www.newamerica.org/international-security/policy-pap...

If i moved away from the us because i misstrust them or whatever reason why would i care about their rescue?

I never thought about my born Country is going to help with anything as i moved away and pay taxes somewhere else. I rather be rescued to “home“

My european passport opens a lot more doors, yet i dont pay taxes to the EU as i dont live there.

Any embassy is in pretty much any country? Assuming a semi rich western country

Your social security benefits are derived, in part, from how much you paid in on your top earning years. Thus, if you didn't pay in you would have very very very little social security (which is already too small of a benefit to live off of). Thus, I don't think there is a moral hazard of social security that would cause people to return to the US for those benefits. They could amend the law (not sure if it's specifics) that you have to pay in a minimum amount if you want to be paid out while living in another country. Simple fix to remove any poorly aligned incentive.

Medicare is much trickier as every American over 65 is entitled to it, but I'm not sure how that coverage works if you live outside the US.

Social Security is not tied to US citizenship. A foreigner who has worked in the US enough years (and paid into Social Security during those years) can move back home and receive Social Security benefits upon retirement.

I have that too with an EU country i was born in. Yet i never paid taxes or anything to there