It's more complicated than that, and while I sort of agree with your point, I think the sic-um analogy breaks down.
THP dispatcher says sic-um to THP trooper. THP trooper (big-dogs) asks Cookeville Police (young-dogs) to come help while they sic-um. Young-dogs shows up and the big-dogs tell 'em to standby and provide back-up. A new threat shows up and young-dog screws-the-pooch. Bad young-dog.
Sorry about beating that analogy to death. 8~/
You have summed up the whole problem here. "A new threat..." presumes that there was an old threat. There was never a threat in this instance except that posed by law enforcement officers acting without getting sufficient information. Part of this is the fault of the dispatcher, some the fault of the individual officers, all combined to point out a law enforcement problem.
The discussion should be what to do about these officers and how to prevent these abuses in the future. Unfortunately some posters confuse the issue by entering these discussions blindly defending any police action. At least you and I are discussing the issues.