Being rude and uncivil does not convince people your cause is just: it just convinces them you are a flaming a**hole. The incivility causes people now on your side to question whether they should switch sides. Being uncivil to others will lead them to be uncivil to you. You may complain how unfair it is when someone treats you badly because of your political views, but that is what you are advocating: a society where people mistreat one another because of political differences. Doesn’t that leave us all worse off and promote behavior that gets you a timeout in kindergarten?