Therein lies the problem.

As a parent you still have a busy schedule. I understand your heart is in the right place but you come off a bit condescending and judgemental. Sure it's easy to be a perfect role model for 1 hour a week or whatever. Parenting is 24/7. It's so difficult to truly make this point to non-parents and what that really entails. They always think they know what's up....until they have their own kids! You must have heard people say "nothing prepares you for parenthood". That, or words to the same effect, haven't become a common phrase for no reason!

It's rewarding, great, totally worth it, sure, and of course every parent should be doing their absolute best and being thoughtful in their approach. But it's hard and everyone will make mistakes, have a bad day or whatever. Quite often you're running on empty especially with really young kids. Obviously any sort of abuse, emotional or physical is unacceptable. A parent has to be able to forgive themself for a bad day though. I do also think it's important to acknowledge the bad day factor to the child, "sorry I didn't listen properly earlier, I was tired and hungry and shouldn't have been grumpy at you". 9 times out of 10 the kid will do the forgiving for you.