Why are humans vengeful?

Answer 1

Vanity and self-serving foolishness.

Answer 2

Instinct.............

Answer 3

Not all humans have a need to retaliate. 

Vengeance is biblical, and it comes from 

an inherent and born-again "christian" disdain 

for those who do not believe in their bookwritten savior. 

Christians condemning anyone 

that they choose is very, very, expected. 

Their anger supersedes 'original sin' ... and they are proud of it.

Answer 4

Some people are and want vengeance now instead of relying on God's vengeance and leaving it to God to avenge them for any wrongdoing that was done to them while they were on the earth. And those who were sincerely patient for God to avenge them, will have their true justice, their vengeance from God and will have rewards from God one day. It is better to seek from God than to do your own vengeance, God delivers swift true Justice and punishment to those who deserve it.

Answer 5

Because when people are hurt, the tendency is to hurt back.

Answer 6

Sin comes to mind 

Answer 7

So i'm assuming you're not human