How do you think gay marriage and marijuana were legalized (thus far)? Fits and starts. Fighting for every single inch. And then eventually victory. Think of any major, significant social progress. Emancipation, suffrage, welfare, worker safety, child labor, etc. etc. Each decades in the making.
I encourage you to read The Waxman Report by former US Sen Henry Waxman to get a sense of how much effort and time it takes to forge policy, move the needle.
Continue to disempower yourself thru cynicism, apathy, and inaction.
Or follow the examples of Sanders, Warren and 1000s of others and learn to convert your outrage into action.