It is a modern fallacy to assume that marriage between two people should be primarily based on their feelings for each other. Feelings fade and so something better must exist in order to base your marriage - and that is the raising of children.

So I agree, your point is valid - parents should not argue or fight in front of their children. Each parent is 50% of their child, so the child feels 100% hated in many of these scenarios.

But we must not conclude from this that the parents must have warm fuzzy feelings towards each other (ie. the modern day definiton of 'love', which is incorrect but nevertheless...). Sure, it helps sometimes, but such pleasurable moments can only be temporary.