I took the whole thing to be more of an editorial than an actual news story. It had much too much flavor to be straight news. I think that most of what happened in that situation can be explained reasonably. For example, burning down the house: Probably done by a candle that was knocked over in the commotion, according to one source, but even so, it's not too far-fetched (in my uneducated opinion) to imagine that a flash-bang or smoke grenade could start a fire. They're not supposed to, but then again, tasers and pepper spray aren't supposed to kill, yet they do, in rare instances. And parking brakes do fail and vehicles do roll down hills into other vehicles.
I think the main thing that concerns me, in a concerned-citizen kind of way, is did the deputies force the dog back into the burning building, and when it was dead, did they laugh about it? Personally, I can't imagine it's possible to force a dog into a fire. I think you could smack it, kick it, shove a stick up its ass, but it just won't go into a fire. And neither would I. So I don't know what happened to the dog, but it did die somehow, so the next question is did the deputies laugh about it? Well, we all know there are some pretty sick-minded people out there. If some people can be in the military and get their laughs doing cruel and unusual things to prisoners, I'm sure there can be people like that in the Maricopa County Sheriff's Office, too. If that's what they were laughing at, if they were in fact laughing at all.
Of lesser concern to me is that the deputies were getting into gear on the scene. I don't know if that's their SOP or if there was a special reason for that, if that was accurately reported. I'm no expert, but from what I've seen on TV (Cops, World's Wildest Police Videos, etc.), SWAT teams show up at the scene ready to go. So this part is curious to me.
Now I'm not saying anything about Sheriff Arpaio; I know nothing of his reputation or record. But reputations are based on perception, not reality. People in customer service are (or should be) taught that what a customer (in this case, the population of Maricopa County) believes to be true is the truth. Case in point: Howard County, Maryland. Howard County has a reputation as being a low-crime area and a safe place to live. The fact is that Howard County has a crime rate that would surprise most of its and the surrounding area's residents. But there is no big city in Howard County, thus no major newspaper of its own, and the small one that does exist has a vested interest in keeping up appearances. Howard County neighbors Baltimore and is directly covered by the news media there, but they have little interest in reporting Howard County's problems. Some of this is because of more interest in other areas, some of it is thanks to an excellent public relations team in the HCPD. Since most people never hear about Howard County's problems, they think it doesn't have any, thus it doesn't have any.