That's a good question. Why don't they want us to know where they live? My WAS did the same thing.
Is it shame?
Who knows for sure.
If MLC is about childhood issues then perhaps it's because they are scared, confused, hurt, souls with low self esteem trying to deal with reality using the only tools they have.
In the past it's worked for them. Little do they know it's not really working. Changing everything on the outside to fix something internal isn't going to work, but they have to figure out for themselves.
They don't want us around but they don't want us all the way gone either. Sounds sort of teenagerish right?
We become a threat so to speak. They don't want us to see them like this. We know the real person, they know we know this. They do their best to mask it. Be it with anger spews, self medicating, projecting, lying, becoming control freaks or rewriting history.
They will do whatever it takes to avoid having to deal with and accept who they are and what happened to put them on this crazy journey.
Sorry for the rant To answer your question fear plays a big part IMO.
They do their best to mask it. Be it with anger spews, self medicating, projecting, lying, becoming control freaks or rewriting history. 
To answer your question fear plays a big part IMO.