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.
For those that didn't participate, murdering the cat.
Everyone by killing Major Scott/the Sheriff. In the original it's an accident (not so much the remake), but regardless it removes any reticence Charlie and Co. have about killing David and Henry/Jeremy. For David himself, it's the final straw.
Villain Sue: Charlie. Despite being an abhorrent human being, he's still loved by everyone. It's even worse in the remake, probably as not to offend Alexander Skarsgard's legion of fangirls.