What are your theories as to why Chris Watts murdered his family?

Severe charactor flaws in addition to Financial pressure combined with the stress of another baby along with the stress and guilt of carrying on an affair. He wanted out of this pressure for the bachelor care free lifestyle. He was approaching mid life and in his narcissistic mind it was now or never. Also don't down play the fact Chris was getting attention from a pretty girl as a guy not used to that and it fed his ego.