You're woefully short on your understanding of MLK. First, he advocated "militant non-violence". He espoused the belief that violence meant the message was completely lost. Second, MLK consistently expressed the belief that people would be judged by their character and not the color of their skin.  All people. Finally, and most importantly, MLK expressed the Christian belief that people can change and find redemption. 

Today, we have outreach efforts to gang members who kill, rob, and engage in unlawfulness. Similarly, people who embrace racist ideologies are morally lost. MLK always stated that people are morally equal. He believed in engagement. 

Consequently, violence is always wrong. Engagement to bring people away from fringe elements should always be the goal. No one has a right to engage in vandalism or destruction of property because they mistakenly believe they're morally superior to everyone else.