Miklós Bánffy said this quote

The public can never know all the facts, ands public opinion is always swayed by passion, never by reason and the best interests of the country.It may sometimes be necessary to stir up passion, but only if action is to follow...but to go on doing so is a great mistake. If one particular hatred is allowed to become fixed in the public mind it can be like putting shackles on the politicians with the results that measures vital to the country's best interests cannot be passed since government is impossible without public support.