The notion that your emotional make up is genetically defined strikes me as wrong, and tragic even if it were true.

It needs to also be mentioned that regardless of origins, hatred, anger, and the capacity for violence are old survival traits. If your scheme were to prove possible, it would be still unwise, because the ramifications of messing with such a Darwinian legacy of selection going back eons is not to be easily understood, if at all.
Our own survival and that of many forebears included these traits as a response to evolutionary pressures we do not fully ken. While nothing is unknowable, I am pretty sure evebn within the strictly Darwinian model that we would want to be very sure of what we are about before turning various genes on and off.

A