If you speak long enough to groups in-person or on TV or radio, you are likely to offend somebody seriously. If you are on a TV or radio show that has a call-in format, you might be called a fascist or a communist, simply for expressing a mild preference for a mainstream political figure. If you are giving a speech, someone in the audience may ask you a threatening question, or worse, try to shout you down.
These problems occur more frequently for politicians and political commentators (as a former political commentator, I received my share of death threats, on-air rants, and Nazi-sympathizing stalkers), but they can also happen to local business people, developers and civic leaders.