actual poor doubling in the past 2 years. And another thing you need to know is, Ferguson PD supports itself by fining Ferguson citizens. This isn't rare in smaller communities. They rely on locals' eagerness to stay local, to do their jobs, etc.
Another is that there is a trend of police brutality there. When one hears a story about a person beaten by cops and then charged because he bled on them, it almost sounds like someone must be exaggerating for effect. That this might have resulted in a question of how exactly the person came to be bleeding and whether the injuries were all that severe, is, well, a bit of a question. (It did not prevent one of the officers involved with the incident becoming a councilwoman.) But record-keeping might not be the strong point of this police force. After all, the slaying of Michael Brown has hardly anything like an incident report. And so sketchy are standards in this area, that even though this event should have possibly affected how area police forces engage with even "off"-seeming people, there was a similar incident (the police slaying of a young black man) and the story of the police differs from the narrative and video of people on the scene. (This was over so quickly with no attempt to do anything but shoot multiple times.)
The behavior of the area LE also has been extremely contemptuous of the protesters (many of whom are just concerned citizens) and journalists. There have been threats against protesters and journalists. Some seem racially motivated. Given this context, that a surveillance video that purports to make Michael Brown out to be a thief, or a tox screen that indicates marijuana in his blood (like this is a surprise to anyone finding he had an interest in 'Sweets, on account of--really?) are distributed to the public in advance of the scanty incident report is hardly surprising. Although it is disconcerting that someone is floating fake information regarding Officer Darren Wilson's alleged injuries--and badly at that. Good Samaritans meaning to treat protesters affected by tear gas have apparently been targeted, as well as journalists. These are not attitudes that sprang up overnight. They were habits of thought and procedure.
There are reasons people are angry--no need to compare them to Selma or Birmingham or anywhere else, really. Their reasons are their own, and why they take to the streets isn't for anyone to judge preemptively without considering what has and is transpiring.