If you want to start a topic on a particular law or approach to policing then do it, if you try to make the case on a topic that is concerned with a specific verdict in a very well publicised event then don't act surprised if people interpret it as being about that case especially if the arguments are all based on the notion that the verdict is wrong and there are mistakes in how evidence is interpreted.
I hope body-cams become the norm. I think it will be much better for the police and protect them in situations like we've just witnessed. Others may disagree and claim it will limit their abuses. The reality is probably somewhere in the middle.
We'll no doubt have interesting crime statistics vs police complaints to explore and interpret in years to come.