The mind does block bad memeories otherwise a lot of us would go crackers, my dad used to drink a lot, and I mean a lot, he insulted my mum, and could be really horrible when drunk but all the real memories of him are good ones, another instance my son was in a real bad accident, buried under a ton and a half of clay,his mouth,nose and ears were full of it, he almost died but he has now got over this and although it is in the back of the mind, it isn't forever on his mind, we also look back on our childhood and all we remember of the schoolholidays is playing out in the sun, the trees were bigger, the grass was greener, the sweets were better etc, were they really that good ?