For sure, it is risky. When the witlesses keep calling on people that have made it clear that they do not wish to return, or that they are not interested and absolutely do not want the witlesses back, they are inviting problems. And next time, it could be worse--some states and countries have laws that make it perfectly legal to shoot the witlesses if the householder has No Trespassing signs up, have warned the witlesses several times, and the witlesses keep disregarding them. Pepper spray, dogs, and cops called on them are other risks the witlesses are inviting by doing this--and it's their own fault.
And, there is the risk that they are going to get the one person that knows how to do black magick. Perhaps they are practiced witches and they learned enough to cast spells on the witlesses. Nothing will happen at the door, but they could be in for a spate of bad luck. Flat tires, cars getting stolen, accidents, getting sick the next day--and what not. Once again, it is the fault of the witlesses who repeatedly showed up despite clear warnings not to--they think joke-hova is going to protect them. They get the wrong person pxxxed off, and they will find out the hard way that it is not going to protect them from anything.