America's dominant culture is toxic individualism. Respecting others is largely thought of a waste of time. There is no culture of shame like there is in eastern asian countries. Seriously, disrespecting people is something to be proud of for a huge number of americans. Everyone looks out for themselves and taking care of number 1 is generally seen as the correct decision. There is incredible income inequality which leaves many of the poor feeling abandoned. The cowboy may be the most famous American caricature. It celebrates toxic individualism and law breaking. This leads to tons of cultural artifacts that glorify crime. Those things all add up to a feeling that the social contract has been broken and crime is an acceptable thing to do.