These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Secondhand Lions
Moral Event Horizon: Walter's mother crosses this when she decides to have Stan stay with her, even though he almost killed her own son.
She possibly crossed it even earlier, when she allowed Stan to take Walter out to the barn. She clearly knew what was going to happen, but let it happen anyway.