Why does politics turn to violence?

Are you familiar with this picture? If not, then you must be living under a rock. This one is an example of politics that turned to violence. People killing each other just to get into positions of power. Gruesome, but nonetheless true. So the question is, why do it always have to end up this way? The simplest reason I could come up with is this word: GREED. Greed for what? Greed for power. Greed for money. Satisfying their own selfish desires that they will do anything and everything in their capacity just to get what they want. Politics is supposed to be the mechanism by which a person can do public service, but some people have other ill motives for entering politics, which in turn lead to violence because these evil people will never give up on power and will fight tooth and nail just to acquire it, nurture it and hold on to it, forever if possible, just what like political dynasties do. They often resort to the infamous 3G's: Guns, Goons and Gold, which explains further why violence is prevalent in politics, especially here in the Philippines. Carl Von Clausewitz was right, war is just an extension of politics through other means. In the case of Philippine Politics, “war” can be considered as “political killings.” What they cannot do through legal means (e.g. filing a court case, having sit-down discussions), they do through extra-judicial means. The solution lies in first, an impartial justice system that will make sure that these greedy people who employs violence will not run away from their crimes scot-free and second, in a truly empowered citizenry who will cast their votes wisely and make sure that these evil leaders will never get into position again.