I don't agree with the barging in of a KH or shouting at cart drones.
I do think however that a respectful discussion with cart people can do a lot of good and so would never discourage it.
Even those that may shout at them I'm not that concerned enough to tell them to stop and it is true they may accomplish very little and in fact have a very reverse effect than intended. The religious fanatics they want to preach some religious dogma they espouse while the jubs are at their meetings or conventions also has no effect whatsoever. I just look at it as coming with the territory of their door to door activity and have a very so what attitude.