Suffering

Immediately after reading this question I think of Guitar and his organization. For every black man, woman, or child killed, man of the black citizens suffer great loses of people near and dear to them. This suffering motivates Guitar and company to take action and energize an equal and opposite act of revenge. Guitar believes so much in this organization that he supports Milkman's journey to find the missing gold and to contribute some to his funds for purchasing a bomb. Whether everyone agrees with Guitars tactics is one thing, but the fact that he is out there fighting against the suffering the black people are feeling is what's important.