Two cats in the barn are talking about yarn. The fact that the game develop the skills needed in adult life. No matter what in the future the cat will not have to hunt. She, at least, will be useful to nimble, agile body and healthy mind.
And for the owner happy and active pet is always better half-ill lazy. So, if the kitten is nothing to play, then he starts jumping on sofas, sharpen claws about furniture and the master’s coat, to carry necessary stuff and do other annoying things.
It becomes a habit, which can already be considered harmful and which are difficult to wean without causing aggressive behavior.