You protest a cause to prevent or change it. You protest the war to end the war. You protest higher taxes to lower them. You protest evolution to promulgate the idea that Adam was made from dust and Eve was made from a rib; you do this to get your Creationist beliefs institutionalized.
For protesting to have an effect, it has to be organized as a group; it has to send a clear message that’s actionable. Venting really doesn’t help because it’s not as if you’ve discharged those negative feelings, you’ve simply amplified them.
I swore my life to protest your First Amendment. Never a regret there. But now it's my turn to exercise my freedom of speech; except I'm doing it in a positive way. Find a way to make it work or be miserable – that's your choice.
I'm not saying don't protest or demonstrate. By all means do that if you can make a difference.