Some People Seem to Delight in Being Mean to Others

Today I read Alma 4 - 8 where Alma preaches to the church members and has success in Zarahemla, Gideon and Melek.  He does not have success in Amonihah however where they kick him out.  Why do so many people find pleasure in inflicting pain in others?  The people of Ammonihah seem way to happy that Alma has no authority over them and then they proceed to beat him and toss him out of the city.  It is a true testament to Alma's conversion and charity that after being treated like that he sorrows for their sins instead of being angry at being treated like he was.  I know when I was a missionary I would get angry sometimes when people would treat me poorly for no other reason than I was a Latter-day Saint missionary.  They seemed to take great joy in being cruel to me and my companion.  It just doesn't make sense to me at all.  Why be mean?  Satan truly has a great hold on some of the people in this life.  Until tomorrow.