Maybe some “normal people” get elected to Congress. It doesn’t seem that any morally sound people last there. Even if a Senator or Congressmen resists personally enriching himself or his family, he must feel threatened into not exposing those who do. These DC legislators write the laws and are very careful to protect their corruption by proxy ventures.
I had a good friend (who shall not be named) who got elected to Congress at one point (part of the Gingrich revolution).
He served quietly and honorably for two terms (as a conservative Republican in a fairly liberal district) before a Democrat beat him. He failed to give his district enough pork...
He has been very quiet since then...a smart guy—so he knew what was happening.