I think it is to isolate the dubs from society and even close family. It's a way to make them different and a test to prove they're faithful. I remember an elder out in service who stated he wanted to destroy all of the outside Christmas decorations because he couldn't stand to look at them. Crazy? Then some in the cargroup decided that the snowmen decorations should be spared because they weren't really christmas decorations. Bizarre?
Later, I found out this particular elder had a long term habit of viewing porn. I guess those images didn't disturb him so much? He's still an elder. Things that make you go huh?