Insects:

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It is a cruel game to pick all of the legs off a daddy longlegs spider until it is a helpless round torso, unable to move or defend itself.
The severed legs twitch dramatically as if possessed, but the spider is no longer a spider. 
Robbed of its marked feature, the exaggerated hair-thin appendages, it is nothing more than a living pebble,
rubbish to be flicked away.

Children can be cold. They will torture and kill a living thing without regret or remorse.
Given the right conditions in the proper vessel, empathy will well up in the soul like a spring.
In unfortunate cases, the well turns poisonous and the spirit, lacking totally in compassion, will form a degenerate life.

If it doesn't pain a fully grown adult to pry the legs from a living creature,
then something went terribly wrong
somewhere along the way.