Don't worry yourself with worldly matters. We would cease to blame others for our own misfortunes because we would be aware of the fact that we brought it upon ourselves. When our heart is at peace, we develop concentration, and with concentration, wisdom comes forth. Wisdom is the key to changing our lives for the better because only with wisdom can we see true reality. If we wish to bring peace to the world, we must start by changing our evil ways.
World peace stems from inner peace.
The ancients often taught of the way to reach attainment through a vase analogy. A conceited cultivator is like a vase filled to the rim with stagnant water, unable to receive a drop of the true Teachings. A cultivator who still holds his own stubborn viewpoints is like an unwashed vase, any true Teachings given to him would instantly be defiled. A cultivator who accepts the Teachings but doesn't put it into practice is like a vase with a hole on the bottom, everything it receives just leaks right back out again. We should not be like the cultivators above, but should accept the Teachings with a pure, humble heart and truly put it into practice.