It invades the healthy cells of reason and logic, of cool headed argumentation and level headed debate. It raises the temperature of the body politic. It often kills. It moves masses. Submerged in and lured by the notes issued forth by the pied piper of the moment - nations go to war, or to civil war, resonating with the echoes of their language.
Language is a leading indicator of the psychological and institutional health of social units.
There can exist no hale society without unambiguous speech, without clear communications, without the traffic of idioms and content that is an inseparable part of every social contract. Our language determines how we perceive our world. It IS our mind and our consciousness. The much touted transition starts in the mind and consciousness determines reality. Marx would have approved.