Congress is a mess, but my Congressman is pretty good, ever here that? That is why it is so hard to defeat an incumbent.
You get the same answer from parents about the school their kids attend, all the other schools are awful, but not the one their kids go to.
People are reluctant to face the reality of their circumstance, if their schools were as awful as all the rest, they would have to do something, and truth is they really don't want to. Same goes for the crook they keep sending back to DC.
Only about 1% of the politicians are replaced in each election cycle.