The thought of the grief they cause their parents has no effect upon their lifestyle. The law of ben sorer regards a willful act of disobedience against parents alone as a more serious crime than an act of disrespect towards parents that also defies the will of Hashem. Horav Hirsch attributes this moral degeneration to a moral hypocrisy in the home. Children who have more respect for their parents than they have for the Almighty must sense a lack of sincerity in their parents' voice when they ask them to carry out Hashem's command. This lack of earnestness translates itself into a serious double standard, of which the parent is unaware.
Children are astute.
They are able to read between the lines to perceive their parents' true inclination. Children are distressed when they are able to distinguish between the mood in which their parents asked them to do their personal bidding and that in which their parents asked them to perform Hashem's will. When we make Hashem's will our own, then our children will make His will - theirs. You shall surely take away the mother and take the young for yourself. The mitzvah of Shiluach Ha'kein implies many lessons.