You have to realize that most people, (some of us here included) would technically fall under spiral dynamic stage orange. A part of that means being very opportunistic. Yes, there are politicians like AOC, bernie, and Ro Khanna who do push policies that one could say fall under "green", but this is relatively rare in this country. Also the large sums of donations these politicians receive does not help at all, as once you accept a donation, you have some what of an "obligation". I think its just that mainstream society is orange, and politicians, or anyone for that matter, will act according to those tendenancies.