alt Hacker NewsIt turns out there is extensive research on this, and you are mistaken. Most politicians actually do try to deliver on their promises. They might get stopped, but they try.
https://strathprints.strath.ac.uk/59403/1/Thomson_etal_AJPS_... for one quick to find example of the literature on this.
Most of the research on this was done before Trump entered office. Trump is a wildly unusual political leader, who is significantly more corrupt than other politicians, promises random things and then fails to deliver them, and generally breaks all of the rules that politicians follow- this is what his supporters describe as his "authenticity", that he "tells it like it is". The more people believe, incorrectly, that "all politicians are corrupt" and "no politicians deliver on their promises" the more likely they are to accept Trump- who again is an extreme outlier among American politicians.
Your cynicism actually ends up ruining the country and makes it more likely that we have bad government.
the reason we have bad government is solely because we're stuck in two silos
want real change? vote third party. the problem is the same as that red/blue button thought experiment recently posted to HN. one of the hardest things to do is to get 50% of people to agree with you, so everyone keeps hitting the red button (voting D or R) and nothing changes