The problem is there's too many people hoping for the perfect candidate, who will champion their progressive vision, who will guide us into a utopian future. People want their vote to feel good.
But that's a pipe dream. That person only exists in fiction. Real politics is messy, because it's a group endeavor, and you will inevitably have to get your hands dirty if you want your voice heard, or else lose your voice to people who are glad you stayed silent.