It seems you're weighing up the 'triggers' that played a part in CW taking out his family. If we remove the 5 weeks apart, would it have stopped him? We can continue to add to the list and it still won't make sense.
Millions of couples worldwide have children, financial woes, affairs, time apart, attractive co-workers, disagreements etc. and they don't murder their families, particularly their children.
If we go along with this thinking, if CW has everything he wants, when he wants it, discards it when he no longer wants it, everyone is safe. No, that's the right. smh