It is obvious that Brown was not acting in a rational manner. Having just robbed a store he drew attention to himself down the middle od the street with the stolen items in his hand. When told by a police officer to get out of the middle of the street he draws even more attention by cursing the officer and refusing to comply. When the office tries exit his vehicle Brown attacks him through window trying to get his gun away. Does any of that sound like the actions of someone behaving rationally?
How exactly is your presumption of guilt based on your disdain for American police officers different than assuming someone is guilty because they are black? If your argument is you can show me a few examples of cops behaving badly I promise I can show endless examples of black behaving badly and I can start in Ferguson.
Did you bother looking to see how many police officer were shot in line of duty in Germany that year? Having a population willing to shot you will make cops hesitate a little less.