Jeff,
I found this article interesting, because so many women experience PTSD from being sexually molested - and if they are able to marry or have a relationship, then their spouse or boyfriend goes through the same type of "tiptoeing" behavior that you described.
Escept in these cases it is usually terror, hysterics, or a deep depression that is brought on rather than the rages (though that occasionally happens, too.)
What is it about our brains wiring that might make us respond this way?
I think it is simply caring for our loved ones - and thinking we are doing our best by trying NOT to put anymore pressure on them. But we can only take so much pressure oursleves. Everyone needs a venting outlet somewhere.