Well of course there are the angelic protectors, who appear as "big men" to evil doers...
Then there is the wise practice of working in pairs. For example, the circuit servant might work with one of the elders while a teen age girl works with an septuginarian. That way both teams are safe, see? Teen age pioneers wil work together. If they run into trouble, they will remember that self defense is satanic, but screaming is okay. Hopefully they will not be terrorized into silence. If a sister gets into difficulty, it is her fault for not using sound judgement - never the fault of thw WTB&TS for sending naifs from door to door.
Hollywood needs to put JWs on the "victims" list for some of their upcoming horror movies. The beneficial subliminal effect on JW yoot could be great.