There's research now that attachment is actually a drive, related to pair bonding, and supported by its own neurochemical system. It's not normally as strong a drive in humans as it is in certain other species, but like other drives, it can be out of whack and out of proportion. (We know that drives can cause strong impulses that can't be explained at the logical or macro level, but do we realize how many small -- well, often small! -- drives we humans have within us?)
What I see in genetic testing is the chance to talk about things that I haven't been able to before -- kind of like web writing, but opening even more doors. (And, yes, there's a little more I know than what I write on the blog at this point.)