This is a question that is highly dependent on culture, history and location. In Europe nobody would bat an eye and agree to that. But the US had malignant actors that tried to exclude people from voting that were not in their camp. It was nothing else than targeted discrimination. So being skeptical is completely warranted, even if you believe that the US has changed. And even then there can still be problems.

It has to do with lacking trust in today's institutions as well as towards the police.