The irony is here, people in this thread have said that some of the eyewitnesses -- or people who claimed to be eyewitnesses -- were probably influenced by other statements. That witnesses have changed their accounts to fit new evidence. Yeah, quite possibly true.
To people who want to see justice done, it is equally suspicious that we're twelve days into this and still the Ferguson PD has not released any kind of statement explaining what the officer's account is or what they think happened. That is normally what police departments do, in my experience, usually within 24-48 hours.
Some people suspect what they might be doing is, they're waiting to see what evidence turns up before releasing the "official version." They don't want to put anything out too soon for fear it might be contradicted by some unexpected piece of evidence that turns up. If that happened they would be dead in the water and they know it. Instead of an investigation some people suspect what they are actually doing is working to get this officer exonerated.
When the police kill someone, when witnesses say it was done execution style, doesn't the community have a right to some basic information from the authorities. Would anyone argue that? That the public has the right to have the police officials say, "Okay we understand there's some questions about this, here's what we know."