Thats just how it is.
You go someplace where other people who don't read the magazines, might, Juuuuuuuuuuuuuuuust might, and you leave them. Who knows, you could save the life of a janitor who comes in to dump the trash in that room and happens to read them. No wait, ... the janitor would already be saved because he would BE a JW already working the night janitor shift so he could pioneer during the day and place more magazines in other places since the hospital is already covered by the "older elder".
Does this answer your question? It's really quite simple.