I saw the video, my opinion: I totally agree with you, there are few comics that do NOT have cruelty, we grow up observing this, what happens is that childhood is a time when we are ignorant and innocent, so we enjoy all this without analyzing it further.
It all depends on the parents, well if they are not immersed in their cell phone, children could be influenced to see some with different themes, I would do it by sitting down to watch with them and motivate them to follow the theme in others.
Now let's analyze Molly's behavior, she sees evil in the cat, but I do NOT believe that a cat carries evil, animals act on instinct.
The moral for me is: Try to be fair, the fact that she sees more attention in the cat than in her, is the trigger that could influence her mind and see what is not there.
Possibly the grandmother would give the same attention to both and the girl changes everything under her jealous mode, she could enjoy her pet and her grandmother by taking everything literally, everything is in the mind and the mind has a lot of power.