I don't think people who are posting about leaving or going away are actually thinking they are making an ANNOUNCMENT on PC. I think they have so much going on in their head they are trying to do what is right although there is conflict w/in them.
We all handle stress, anxiety, hurt etc in different ways.
So, what one might not do...one might feel is best for them to do.
Put it in a perspective that we all deal with things differently and then maybe people's post about going away or leaving won't be a trigger or burden for YOU since it has nothing to do with YOU but with the PERSON posting.