You guys keep confusing the definition of "cold blooded".  It doesn't pertain to innocent, guilty, or any of that.  Cold blooded typically just means that  the murderer killed someone in a calm collected deliberate manner.  Killing someone because they are abusing your child is reacting in anger or vengeance, which is the opposite of cold blooded.

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Also, you don't get to determine who is innocent or guilty in the U.S. which is where this took place.  That is why we have a legal system.  It isn't tit for tat or eye for an eye.

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To be clear, I am not stating I wouldn't have a similar reaction if someone abused my children.  I am just stating objectively that my actions can't be condoned and I'll face consequences for my actions as well.