If they really cared about people's lives, they would NEVER preach.
Why?
Because those that DO NOT HEAR THE TTRUTH will just be judged by Jehovah at Armageddon.
But those that DO HEAR THE TRUTH are subject to following all the rules and regulations of the organization, and have to deal with imperfect politicos in the organization to maintain their good standing.
Preaching to someone endangers their chances for eternal life - who knows if they might make a small mistake that could lead to bad standing, and they wouldn't have the chance to patch things up (after all The End is So Near). Who knows if they might accidentally make an enemy of a politico in the local BOE who could stumble them just moments before The Great Battle.
It's kinder to let Jehovah judge their hearts at the proper time. Ignorance is salvation.