corruption doesnt exist without a reason. in usa, corruption levels are very low and it isnt a kind of a lie or stat. manipulation. now, lobby, and its very good. it(corruption) isnt even a problem there.
i get that ur want to say politics are no more than a show to watch and a party is no more than a favorite team to root for. but elections make a difference even if there a lot of those who want it not be.
all in all, politicians are also all human. they might be not genius but they arent stupid either.(YOLO)