" We may be able to filter out certain undesirable tendencies through genetics, chemical treatments, beta scans, we deter with penal colonies and the absence of freedom. But human nature remains human nature.” “Those basic motives for violence that science is unable to filter: love, hate, greed, envy, anger.” “They separate us from the droids, don’t they?” “And make us susceptible to joy, sorrow, and passion. That’s a debate for the scientists and the intellectuals. "

― J.D. Robb , Glory in Death (In Death, #2)