I remember reading, right in their own Bible, that Jesus spent a lot of time preaching to people right out in the open. He could preach to a crowd of thousands of people, and get a good number of them to listen to the message. Very few, aside the rulers that were threatened by the message, actually objected. Many did have flimsy excuses to not move forward, but few actually protested.
Compare to the witlesses. They have to go from door to door, usually in pairs. You get one householder that doesn't have time to prepare, and the witlesses place pressure on the householder to accept the littera-trash. Then they get put on the spot to let the witlesses return, usually before they have time to thoroughly cross-reference anything. Most of them are not very literate with the Bible, so they believe the scams that the witlesses have the monopoly on applying it properly. And once they get going, they are scared by "Satan is trying to lead you away from our message". They get pulled to boasting sessions--which are always held in closed buildings.
Now, I bet that, if the witlesses held their meetings in the open like Jesus did, they would get plenty of walkouts and even more bad publicity.