Corruption is never so rife as in communities where the demagog and the agitator bear full sway, because in such communities all moral bands become loosened, and hysteria and sensationalism replace the spirit of sound judgment and fair dealing as between man and man.
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“Moreover, while such preaching and such agitation may give a livelihood and a certain notoriety to some of those who take part in it, and may result in the temporary political success of others, in the long run every such movement will either fail or else will provoke a violent reaction, which will itself result not merely in undoing the mischief wrought by the demagog and the agitator, but also in undoing the good that the honest reformer, the true upholder of popular rights, has painfully and laboriously achieved. Corruption is never so rife as in communities where the demagog and the agitator bear full sway, because in such communities all moral bands become loosened, and hysteria and sensationalism replace the spirit of sound judgment and fair dealing as between man and man. In sheer revolt against the squalid anarchy thus produced men are sure in the end to turn toward any leader who can restore order, and then their relief at being free from the intolerable burdens of class hatred, violence, and demagogy is such that they can not for some time be aroused to indignation against misdeeds by men of wealth;” source