There is considerable variation in the amount of anger different children feel toward their parents, depending mainly on how tactful and sensible the parents have been in their general management. But there is no such thing as a child without some resentment at times. And there is no point at all in parents' trying to raise their children so sweetly and reasonably that no conflicts develop. The children will only test the limits until the parents can't help exploding. These words come from one who has been giving insightful advice to parents for more than sixty years.
Current authorities give much the same advice.
A child who is too good, who never hits or strikes out at another, may also be a child who cannot hit back. It goes underground and works to feed on guilt. It can punish a child in ways we would not wish. Children need to be aggressive, but in the right way. We need to help them create their controls.