On the third day when the discomfort was expected to reach its maximum and the men would be unable to pick up a sword and fight back, the two brothers came to the city. The men were all resting at home.
All started from righteous anger. Maybe we notice a sin in another: laziness perhaps. What do we do? Become infinitely worse in our reaction? Is our reaction godless, wicked? Does it perpetuate feuds? Do we react in a wholly wrong way? It may be that you have a pet hate: one sin you avoid, and notice it in everyone else. Such is the trick of the devil.
Once grisly work was done, the other brothers join in with the wholesale looting. How quickly those who claim to be different are led astray by an evil example. Perhaps they did not want to get involved in the initial murder, but they were ready to help with the looting. Bad examples test resolve. Some who only kept apart from some evil practice for the sake of appearance will soon give way when that practice becomes the norm. One person’s sin infects another, in the family and in the church. It doesn't seem to take them long.
Christendom offers all sorts of ways of promoting church growth – it has become a boon trade. Make a science of it; observe rapid growth, and analyse and draw up schemes to encourage it, but do not bother about the Spirit of God! These schemes lead to disaster, minimise Bible study, and produce churches not worth having.