Humans would like to think they are special and better than other species.
But at the end of the day we are animals too. We evolve from animal.
We have animal instinct.
And one of those instincts is to ensure the survival of the species.
In this fathers case, he simply eliminated a tainted strain of the species.

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CHILCUTT~
The secret to a long life. Is knowing when it is time to leave.