Retaliation is not a political argument in favor of your cause

I have been surveying the headlines of the latest mailbomber, a man who has been caught mailing bombs to critics of President Donald Trump. Once again, we are treated to a display of violence in response to people expressing their politics. I also note that numerous politicians are saying that violence has no place in politics, and I agree with them, but none of them are calling that man who has been mailing bombs, a terrorist.