If the "right" and the label "murder" are being evaluated in the same terms and context, sure. But here in this thread it's not quite that simple.
Given the authoritarian mindset inherent in police work, coupled with:
1) a propensity or lean toward physical violence, very common and positively correlated, and
2) ingrained racial bigotry, also common and positively correlated in the US
we are no longer necessarily talking about technical, legal, murder, but rather what strikes a decent minded and informed observer not afflicted with the same mental biases, in an informal and generally overall moral and ethical sense, as "that was murder". And the question being: is there, in real life, a significant gap or distinction?
On the one hand: Not justified killing, in that moral/ethical sense. Something a good person, or good police officer, should not have done - seriously, should not have done. "Murder", in that sense, and no "right" to commit it.
On the other: But it's legal, they have the legal and socially accepted, formal and operative, right to have done it. And to do it again, in the future.
The question in the thread is: do we have that situation, in the US, right now?