That gives that person the opportunity to go out there in our shared spaces and it gives me the opportunity to disagree with them, share my perspective and oppose them. Maybe someone goes to jail or whatever. But conflict is an important part of society.
Rather that than people living in their own bubbles, thinking everyone agrees with them while sitting on their hands and whining into the void and thinking that counts as progress. Put yourself out there, take a risk, engage with your opposition, you might learn something about them or about yourself.