Why is humanity so wrong?

I honestly don't know what's wrong with us? Why are we so violent, why are we so murderous and jealous? Why do we commit so many crimes under the flag of peace, change, food or whatever selfish reason there is? In a christian point of view its because of sin. For me i think its because we are all very uneducated in the ways to be better, kinder, grateful and many other things that people are starting to no longer show
Why is humanity so wrong?
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