There’s just a lot of inequality in the US that is both socially and politically unacceptable in the rest of the developed world. Extremes are more accepted here.
There are more extremely rich people than you would see in other Western countries and and many, many more extremely poor people than in other Western countries. Alleviating that would mean implementing policies to redistribute wealth that many Americans are not willing to implement, especially conservatives.
The US basically sacrifices the good of the many for the great of the few.