#1 Vindictiveness. Giving complete strangers the benefit of the doubt and then being spiteful to those you are closest to.
For instance, when a stranger shows up he seems to be the king. Relatives and friends get spiteful, the stranger rules all. No one would want a stranger to think they are mean would they?
Try it, Take notice how your spouse and relatives change their attitude towards you when a stranger shows up.
I have accused my mother of this many a time: "you become vindictive towards me and give a complete stranger the benefit of the doubt" I ain't shittin it's fucked up and drives me nuts.
#2 RELIGION probably the cause of #1.
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