Pardon me, but summary executions in the United States taking place in broad daylight, with seeming impunity, is very much a new and novel phenomenon, and incredibly interesting to many of us.
These are events of historic significance.
You would need to actually grapple with the specific context to be convincing. Otherwise you could just as well respond to a police officer smuggling an automatic weapon into the senate chamber and unloading the magazine into the lawmakers with "hate to break it to you - but officers killing people in the US is not new".