I understand. However, there isn't some binary pass/fail criterion. This community can become incrementally better (obligatory "less wrong") or worse. Your contributions are helping steer it along a good path (ahem, usually).

If you've set extremely ambitious goals for yourself ("I will make this community live up to its full potential"), and those then stop you from pursuing more realistic milestones along that trajectory, then you've shot yourself in the foot:

The perfect is the enemy of the good, and all that. Compare "Can't stop world hunger altogether [assuming that's your ultimate objective], so I should stop donating anything towards that goal."

People care, at least more than we allow ourselves to think from within our protective cynical bubble.