Now it makes no sense other than being an obstacle, and therefore one more thing in the way of people actually running the government.
To me, this nihilistic cynicism is self-fulfilling. If the population believes and furthermore accepts, as you do, that politics is inherently irredeemable and corrupt, then that is the politics we will get.
Even if a system is riddled with problems, it is the obligation of a citizen to at least give a damn and expect more from the system.
Additionally, it is ridiculous to ridicule people for trying to fix issue #1 just because there are 10 issues. We can call for fixing, through mere voting or more strictly through law, that legislators are to be mentally fit and retire when they are past a traditional retirement age.
We can also be demanding/expecting our legislators to work for our communities, or lobby/petition to change House elections to Ranked-choice, to lobby for campaign finance reform, or whatever changes you feel are necessary to the structure of our governments.