Bart runs at a substantial deficit. Bart needs fares to make up for its deficits.
The deficits effectively result in less funding for other (more efficient and more effective) transit systems such as Caltrain and buses.
So the bill hurts minorities by hurting overall sf bay mass transit which is used by minorities.
What’s interesting here is to compare SF mass transit, and European mass transit. You won’t find a single country in Europe trying to decriminalize ‘free-riders’. Without the fares, none of them would flourish or survive.