It's unfortunate, but I don't see the problem. Pointing out that the dude tending the illegal grow is Hispanic is not racist, nor is it an effort to stir up a racial debate. It's a fact which speaks for itself. So is the fact that he had no identification, was armed, and was growing a shit load of pot illegally on government property. As a general rule, police do not simply blow people away for no reason. Until I hear facts that suggest otherwise, I will presume the police officer was justified in his use of deadly force. Cops, particularly ones involved in this area, realize that they are up against increasing public sentiment in favor of legalizing marijuana. To suggest that they are dirty, or liars, or there is some kind of cover-up taking place is not supported by any facts let alone common sense.
It's a fact that there is a serious criminal element via Mexican drug cartels growing and selling marijuana in the U.S. To suggest otherwise is nonsensical.