I think when you have had a life where you have not been given enough - not enough love, attention, time, space, consideration, respect, nurturing - being given a little bit and then having to wait for more is a very precarious and unpleasant place to try and negotiate. I think it can feel cruel (even when that is not the intention) and the very nature and frame of therapy can threaten some re-enactment of painful dynamics. Far easier and safer to not have the thing at all than to try and be satisfied with being given a small piece which doesn't last and is not enough.