I do agree with all the above: Generally, cops shoot people for a good reason. If you don't want to get shot, don't fight with the police, etc.
That said I bet what is really troubling people here, and may even be what actually motivated the initial comment, is that there is not enough oversight of the police. Whenever any politician tries to impose stricter civilian oversight of the police the police union cries foul.
It's my opinion that anyone in this country with the authorization to kill people needs absolutely the strictest, strongest levels of civilian oversight. I don't think we have that, and I think that has led to unwarranted levels of corruption in the police, including at the federal level (RCMP) and in many municipalities.
There is, at a minimum, the perception that the police act with near impunity. In and of itself that mere perception is utterly unacceptable. We have a right to KNOW that there are due processes in place, which are overseen by civilians and not by insiders.