Perhaps we should put you in charge then. At the end of the day you are innocent until proven guilty. Also the first amendment covers freedom of speed and belief. As long as they aren't breaking the law by harassing someone or disturbing the peace they are protected. With that being said there are lots of ways that being racist or discriminatory will hurt the offender. They are likely to lose there job and to be banned.
These same Democratic principles apply to anyone with any view. You can't stop a black lives matter protest because you think black lives don't matter. Democracy means we all get a voice and that we have systems in place to resolve issues and to find justice. It isn't perfect in the least but you can be heard.
That's also what makes mass surveillance and warrantless data collection to identify suspects so dangerous. It doesn't just affect a small group of people. It targets us all and keeps the public in fear of the government. Only evil thrives in darkness. Anytime something happens behind closed doors the chance of corruption and abuse skyrockets. We need people to be informed of the processes and to understand the system so that they can participate in it.