I agree riots should not happen but look across the world at incidents where a group of people feel they have been tormented or wronged and their words have fell on deaf ears, then the anger explodes after a major incident. I often wonder why in the world they riot after a simple hockey game or a soccer game but it happens....
Dr. King had one method of dealing with it which was non violent basically when they spit in your face do nothing but turn the other cheek, yes that worked to some extent but as they say everything is not for every body thus you have the people that take the approach you spit in my face I'm going to punch you in yours, people are different, especially when the people doing the spitting were the original American terrorist blowing up churches, killing men, women and children and all of these things together advanced the movement. You saw this difference during the Riots, some where trying to tear everything up and some where trying to stop them, take Deny for instance there were those that beat him but also those in the community that saw this broadcast live on TV left the safety of their homes and went to the scene to come to his rescue, getting him to the hospital before he was attacked again and or bleed to death.
I agree with you about people disagreeing but people have bias or beliefs and because of the position they hold when that surfaces it can mean that person A is treated differently from person B, people on this forum express their beliefs in that certain bias comes out and that was the context it was being used in.
In reference to people moving if they feel oppressed.... well first of all we were discussing things and feelings as they were during the time of the LA Riots some 20 years ago, a lot has changed, some as remained the same, with that said moving is just not an option for many people if they could they would, every body does not have the resources to up and move nor should they have too, especially if it's because of the people that are supposed to work for them.
When DC crime was at it's highest my parents were able moved to the suburbs after I graduated from HS and was headed to College but It's mute point now because in the area I grew up in and in others like it that I have traveled to over the past 10 years these area are going threw gentrification (which is another topic) the basic services and request that long time residents of the community have been asking for magically have started to appear and property values are crazy, like average home is 400K crazy, a nice one bed room apt can cost you 2K crazy.
Actually some things did get better after the riot, if I remember correctly Asian and Black community bridged some gaps and a better understanding was formed, LAPD recognized it was out of control and the prior chief I think his name was Gates was removed and out of that came an effort for officers to respect the community they were sworn to protect.