what is culture caste and creed in pure human life?

Question

why people fighting for this when the colour of bllod is one and tha is red

Answer 1

Recognition of our differences seems to be human nature.

Use of those differences via hate, is used by those with a sick need for power. From as small a form as our relatives who need to put others down to make themselves feel better, to the religious leaders and politicians who use it for recognition and political power.

It's usually fed by other things.