I'm not gonna tell people not to protest. I've been to these (not in a while but still...). It's reassuring to not feel like a mad person to think everything happening is un-American, or at minimum contrary to all the high-minded ideals that built the country.
But aside from the fact it's the same set of people who consistently see the wrongness of it all (the people who voted for this nonsense aren't changing their minds and joining the protests), protests are just catharsis. Voting at the right time is what matters.
