Publius takes the position in Federalist 10 that what is minimally necessary to encourage justice is a negative provision to prevent bad men from interfering with the citizens' spontaneous tendencies. Later, he will show how the separated powers provides positive support for such tendencies. Accordingly, the extended republic offers means for opening the way to a natural flowering of just public opinion. A variety of self-interested factions cancel each other out in popular negotiations. That variety, as we today well know, increases with geography and technology.
Separation prevents local factions from easily combining their resources.
Furthermore, overbearing motives give way in negotiations among would-be allies more readily than just motives. Publius relies on the fact that bad men must hide their self-interested designs. When allies become conscious that their leaders' designs are hypocritical, they come to suspect them. Publius' great claim to fame is that he and his fellow founders have been able to preserve just opinion without a utopian reliance on unswerving dedication to morals or religion. Alexander Hamilton, James Madison, John Jay, The Federalist Papers , ed.