everyone lies because the truth sucks.
You dont wanna offend, so you lie
You wanna get laid, so you lie
You want something, so you lie
You dont want something to happen, so you lie
You dont wanna pay for something, so you lie
You dont wanna go to jail, so you lie
You dont want your wife to find out, so you lie
You dont want to do something, so you lie
You want to get out of something, so you lie.
Conclusion- humans=selfish, therefore, what the person wants, rules all, therefore, they are looking out for number one, and in an attempt to better their own life, they lie.
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-makes things more interesting sometimes too