This painting is based on the old phrase “Two wrongs don’t make a right”.As visually shown, the one right (tick) outweighs the two wrongs (crosses). This also draws on the idea that revenge is not an effective solution for creating peace as revenge only fuels more anger and revenge.
Repay no one evil for evil. Have regard for good things in the sight of all men. If it is possible, as much as depends on you, live peaceably with all men. (Romans 12:17-18)