Just a few thoughts-
1. I don't automatically believe what I read in a media report. You just don't get the entire story.
2. Notice how the entire report is told by the cops. Every statement ends with "police said". Now I'm not anti-cop, but the fact is, cops don't always tell the truth. And sometimes they might flat-out lie to bolster their side of the story.
3. No one looks like an upstanding citizen in a mugshot. I doubt anyone here would look innocent after a long ride in the back of a police car, in handcuffs, and after possibly spending hours in a very uncomfortable holding cell (been there, done that).
4. The report doesn't say how many of the family members were carrying knives. Perhaps only two out of the family had knives. So it's just possible that the family isn't a bunch of crazy knife-totin' rednecks. Just think, with all of the knives YOU own and/or carry, how might YOU be portrayed by the media?
5. Like Glistam pointed out- the family members didn't use their knives as weapons. So perhaps they aren't the crazy, vicious criminals that they are being portrayed as.
6. Sometimes cops cross the line and abuse their authority. Sometimes they are abusive to citizens. Sometimes they use excessive and unlawful force. And while it's
generally not a good idea to fight the cops, we weren't there, and we only have the COP's version of the story to go by. For all we know the cops may have started the fight by using unlawful force, and the family was defending themselves.
7. Believe it or not, but a citizen does have the legal right to use force against cops if those cops are using unlawful force against that citizen, and if that citizen has a reasonable fear of death or great bodily harm. I remember a big case from the mid 80's here in San Diego where a young man killed a police officer, claimed self-defense, and the jury acquitted him. Here is a link to that case-
http://www.nytimes.com/1987/07/17/us/man-acquitted-of-killing-officer.html
Personally, I try not to jump to conclusions based on a single, one-sided media report, as told from only the cops perspective.