for the same reason that there is war and conflict in the world... @
TnNinjaGirl said it best. People don't like to be wrong and their egos don't allow for improvement.
As I've said before, if you think you're better than the next person, you are a part of the problem.
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My therapist has 2 wheels and a seat.
If you are ever in doubt to my tone, please refer to my avatar.