You say you've always wondered why that is, but it doesn't seem like you're prepared to consider the possibility that America, in its current state, actually is

You say you've always wondered why that is, but it doesn't seem like you're prepared to consider the possibility that America, in its current state, actually is a desirable place to live for a majority of the world's population. If stats tell you one story but reality tells you a different one, then you should ask why that is, and not say the numbers are right and reality is wrong, or vice versa. There are more possibilities than just the world is getting bamboozled by brainwashed Americans online.