"Opposers" do not always mean police authorities. This comment in the WT is more applicable to areas where religious fundamentalism runs rampant.
A few years ago, in my neighboring congregation, 2 publishers were rounded up by a mob of 30 people while in the field. Under pressure, one of them ratted out the Coordinators name and address to the mob, which then went and trashed the poor elder and his teenage son. He still suffers from a fractured ear drum.
Many JW's live in places where mob justice precedes police interrogations.
This is just one of the many cases that happened in India. I believe this is true in many other countries as well.