the cause of racism

when ethnicity A discover 

that there are unrighteous individuals in ethnicity A 

then ethnicity A will start a conflict with ethnicity B 

so that the survivability of unrighteous individuals decreases 

and when ethnicity B discover 

that there are unrighteous individuals in ethnicity B

then ethnicity B will start a conflict with ethnicity A 

so that the survivability of unrighteous individuals decreases