Because the 2 parties are unfixable and unwork-with-able, this is where the anarchists have it right. You help the corruption eat itself and take the pain, or condemn your kids to worse.
This is where it would have been nice if they’d actually succeeded in outlawing political parties. In the end political parties want power, the ideology is there to serve the acquisition of power and nothing else. Which is why they’re so good at agreeing on things that impede 3rd parties and internal rebellions.