Why do they riot in Ferguson?

Why do they riot in Ferguson?
What are they protesting?
What do they hope to achieve?
Do they want to destroy a cop, just to see if they can?
Do they want more black cops? Some black cops? All black cops?
What does the Left want?
Do they want a mob to convict an innocent man by proxy? Isn't that like - lynching?
Do they want cops to stop enforcing the law in majority black neighborhoods?
Do they want cops to let a suspected thief go - if he's a young black male?
Do they want government to just do what they want it to do, whenever they want it?
Do they want to a ruler instead of the rule of law?
Do they want government to put people on trial based on emotion instead of evidence?

Do I want to live in THAT country?