I am not sure about how much philosophy is responsible for present day problems in politics. They ought to be separate fields. After all, they deal with different subject matters. But the effect of philosophy on politics has been mostly detrimental. England became a forerunner of modern democracies without the slightest influence of philosophy, but rather from the need of Edward the First to collect taxes with the tacet agreement of the lords [thus creating Parliament], and the result of Simon de Montfort [a crusader]] seizing power from a corrupt king, and thus creating the provision of Oxford. (Magna Carta was the result of a desire of the lords to limit the power of the king. )[John Locke was after the fact of the Glorious Revolution, not the cause.] Whenever philosophy professors venture into politics, their effect is almost always detrimental. [Take a look at the short dialogues of Plato and you will see tremendous depth, freshness and insight. but when Plato gets into politics in the republic and the laws, all that goes out the window.