I should think that being new in this land would make any person willing to talk and go along with it, whether they were really interested or not.
I knew an ex-missionary at Bethel that told me a story about his time in Africa. They had a waiting list for bible studies. By his admission, it appeared that the locals considered it a step-up in their social status to study with the witnesses. Since numbers are so important to JWs, who cares about motive.
The witnesses do not preach, they count time.