A friend of mine, who has had the census harassers come by a few times, just had their door window broken. They told me that they've had census harassers knock on the door, hard, for several minutes, and then walk around the house, knocking on the other two doors. This person has chosen to just not respond in any way. This last time, they were knocking hard, over and over again, until they broke the door window. They then left a note on the door to call about scheduling time for an interview, and took off. The resident was in another room listening, and heard the window break. They told me they were shocked, and preparing themselves for the possibility that this idiot was entering their home.
It's hard for me to believe that these idiots haven't gotten themselves shot yet... or at least, I haven't heard about it if any have.