"I think...that it is not possible to set theoretical limits to the power of the State to legislate against immorality. It is not possible to settle in advance exceptions to the general rule or to define inflexibly areas of morality into which the law is in no circumstances to be allowed to enter. Society is entitled by means of its laws to protect itself from dangers, whether from within or without. Here again I think that the political parallel is legitimate. The law of treason is directed against aiding the king's enemies and against sedition from within. The justification for this is that established government is necessary for the existence of society and therefore its safety against violent overthrow must be secured. But an established morality is as necessary as good government to the welfare of society. Societies disintegrate from within more frequently than they are broken up by external pressures. There is disintegration when no common morality is observed and history shows that the loosening of moral bonds is often the first stage of disintegration, so that society is justified in taking the same steps to preserve its moral code as it does to preserve its government... the suppression of vice is as much the law's business as the suppression of subversive activities."