I understand. I have never stared down the barrel of a gun; they say it is like looking into your own grave. Giddings helped defend burglars, thieves, other nere-do-wells. I do believe she realized bad things happen and she probably thought about it ahead of time.
MCD appears to be socially awkward in the interview. Let's face it if he were being interviewed because he just saved a child from a burning building everyone would be saying "Awwww....I can see he is a kind and loving person...he looks like such angel...so sensitive and caring... the way he talks and his eyes and all" but because he was labeled a POI in a hideous murder everyone is saying "Oh...yeah he is obviously deranged, look at his eyes, I can just imagine him hacking up a corpse in a bathtub..look at how he talks....weird and crazy I can tell".
MCD has some issues, no doubt about it. If he is all that "odd" and crazy he would have left some darning evidence and they would have likely charged him by now. He is the "weird kid" they can hold while they try to find the real killer, holding anyone keeps the public calm.