Very psychoanalytical but the simple fact is that its a command from Jesus....it wasn't optional (
Matthew 28:19-20)....and it wasn't just door to door either. Christians were to preach anywhere they find people. You will often see our mobile carts on the street, or going around the businesses early in the morning when they are not busy. Sometimes its just incidental, waiting in a doctors surgery or at a bus stop or train station......we're everywhere....
and we love to tell people about God's Kingdom.