26 Now it is not common that the voice of the people desireth anything contrary to that which is right; but it is common for the lesser part of the people to desire that which is not right; therefore this shall ye observe and make it your law–to do your business by the voice of the people.
27 And if the time comes that the voice of the people doth choose iniquity, then is the time that the judgments of God will come upon you; yea, then is the time he will visit you with great destruction even as he has hitherto visited this land.
30 And I command you to do these things in the fear of the Lord; and I command you to do these things, and that ye have no king; that if these people commit sins and iniquities they shall be answered upon their own heads.

These verses are both comforting and terrifying. Comforting because they suggest that human nature is generally good and that in a democratic system the majority will often make the right decision most of the time. 

On the other hand, a minority will often teach and advocate for evil. Faction and dissension are hallmarks of free society.
 The danger comes when interest groups gain power over and impose their will on the majority. In time, such wicked conduct becomes normalized and a majority come to accept it and to celebrate sin and iniquity. This process turns fringe vices into accepted practice. 
There are other dangers when a minority gains too much power. All too often, identity politics and us v. them dynamics are needed to maintain and preserve such a situation. If the majority is divided and cannot unite, then the wicked prevail.

We see this problem at work in the primary process. Majorities reject xenophobia and bigotry and yet candidates that promote such cases views thrive. 

Unfortunately, we will all be held accountable for how we except used our agency in a democratic society. There is no king to rationalize or take away our guilt. These sins are upon our own heads.