Seems that there are some misconceptions. I also like how they want more money spent on them and less on policing. How about obeying the laws and not looting your own backyard...
"But looking at the Black Lives Matter campaign in detail raises some worrying queries. For example, on its website, the group claims that “every 28 hours a black man, woman, or child is murdered by police or vigilante law enforcement.” That is a deeply questionable claim. According to theWashington Post, which is running a tally, 155 black people have been killed by police so far this year—out of 607 total. That is not quite one every 28 hours—but no matter. What is important, however, is that less than a tenth of this total was unarmed, 24 of whom were black. So to state that every black person killed by a police officer in a country as violent as America is “murdered” is inaccurate. Sure, 155 people killed by police is too many, and 607 is a problem, but of those who were black 85% were armed.
The view that police officers are mostly murderers, however, runs through the site. On the“National Demands” page, for example, the campaign calls for the "immediate arrest" of Darren Wilson, the police officer who shot and killed Michael Brown in Ferguson, Missouri, last year. This despite the fact that a grand jury decided not to prosecute him. There are reasonable arguments to be made about biases within the grand-jury system, but jurors have decided there is not enough evidence to prosecute Mr Wilson. Throwing out the rule of law over frustration with a particular decision is a dangerous way to win reform.
Another Black Lives Matter demand is for a “decrease in law-enforcement spending at the local, state and federal level” and “a reinvestment of that budgeted money into the black communities most devastated by poverty.” There are legitimate complaints to be squared at the culture of certain police departments, which are often more confrontational than necessary with certain demographics, particularly those who are poor and black. But it bears mentioning that many of these same poor, black people desperately need the police, too. It should not be considered a right-wing talking point to note that far more black people are killed by other black people than by police officers. Baltimore alone has had over 200 murders so far this year—almost all of young black men. What black people in cities such as Baltimore and St Louis need isn’t less policing. It is better, less institutionally-racist, less thuggish policing that actually solves crimes. If so many murders didn’t go unsolved, then perhaps there would be fewer of them."
http://www.economist.com/blogs/democracyinamerica/2015/08/race-and-criminal-justice