I have stated before on here about how USA politics are broken into such ways that each side has a glimpse of the truth so that their ardent followers say ‘see!? See!? How can you deny this!?” while being filled with falsehoods that are taken as gospel.
For this I am going to take two simple beliefs of both sides:
Social style economics: higher tax rates but the benefit is social programs to help those down on luck, invest in infrastructure, healthcare etc.
Pro-multicultural: Let all cultures in, and we will be enriched by their diversity which will make us more well-rounded.
Capitalist economics – Everything you do, you do on your own, do what it takes to get ahead, individualism rampart, profits are yours but so are your problems.
Anti-multi cultural/immigration – Rarely directly stated but that whites are better, and we don’t want your kind here, we esp. don’t want your cultural.
The problem is, these beliefs are partly antithetical to each other. Take liberalism, socialism is great I truly do approve of it, but the problem is it is a socialism for the minorities at the cost of the producers – whites and asians primarily. Whites work to fund blacks in inter cities, that is a fact while getting very little benefit. Thus republican criticism is valid about ‘hating socialism’ because you are NOT benefiting your in-group.
Likewise capitalism has a natural bend towards anti in-group because if you can screw your neighbor to get ahead you will.
Naturally, socialism and nationalism/racism/ingroup mentality IS sustainable. You are sacrificing for those you are either directly related to, or have distant genetic relationship vs the current mess where your sacrifices go to people that could care less about you and would slit your throat in an instant.