Laughter at times that seems inappropriate to others is really a way of coping. Police do it alot when faced with some of their crime scenes. They just can't let things get to them and sometimes the laughter breaks that stress barrier. Not that they are being disrespectful, it just helps them deal and detach from the situtation. I would imagine LA might have picked this up from his father as this family is able to detach themselves quite easily....all of them. JMO
This is a really good point and the more I listen to him it seems to be what he does. And I know police even make jokes at murder scenes just to help cope with the situation. The fact that his father may have unknowingly passed this onto LA is definitely an interesting point of view.