The men who profit and make their living by the depravity and the awful misery of other human beings stand far below any ordinary criminals, and no measures taken against them can be too severe.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“Sentimentality on behalf of such men is really almost as unhealthy and wicked as the criminality of the men themselves. My experience is that there should be no toleration of any "tenderloin" or "red light" district, and that, above all, there should be the most relentless war on commercialized vice. The men who profit and make their living by the depravity and the awful misery of other human beings stand far below any ordinary criminals, and no measures taken against them can be too severe. As for the wretched girls who follow the dreadful trade in question, a good deal can be done by a change in economic conditions. This ought to be done. When girls are paid wages inadequate to keep them from starvation, or to permit them to live decently, a certain proportion are forced by their economic misery into lives of vice.” source