A peaceful planet will only be a possibility when the non-peaceful no longer exists, when segregation, hatred, greed, and ugliness toward others are eradicated. Teach peace not war. Teach compassion. Teach love. Teach kindness. It’s that simple.
Yes, evil exists; it is a fact, but it will have no power if mankind disengages from it totally. Peace and love are powerful allies, engage in them instead. Do not only teach them but fully embody peace, love and total acceptance of all beings and the world will be a better place. Look not beyond the self to solve the problem, become the loving peaceful change you seek.