No system is perfect! Corruption is far far worse now!
You’re fooling yourself if you think it isn’t.
Compared to the necessity of maintaining the Federal system the Founding Fathers set up corruption is a minor minor problem! Moving us away from being a republic has introduced far far more evils then a few corrupt senators can conjure up.
Basically, America is now a "democracy" because everyone can vote. Our Founding Fathers did not want that.
America was closer to a Republic before the 19th Amendment.