Yeah, you might be right. Pretty much they're just looking to match your name with something (an address, DL#, or something). If the info you give them doesn't match anything, then that's when problems start. If you refuse to give them any info, and there was a crime or infraction behind the original stop (which they have to identify) then they can take you in to ID and to determine if they're going to charge you with anything. A lot of the time, guys with outstanding warrants will do this. They'll fail to brandish ID, or try to give incorrect ID (knowing that their ID will pull up warrants - even outstanding parking fines show up <-- I had a cop talk to me about my parking tickets once

). So if you're a guy that is adamantly defending their right to privacy, you've know piqued their interest in you because they probably suspect you have warrants or something. They'll also treat you as high-risk and handle you more heavy handed because if you come back 932F (wanted for outstanding felony arrest warrants) you could be dangerous because you'll be desperate to escape.
Look folks, I'm not one to go crazy and blindly defend overly aggressive cops (if you know me of facebook, I'm pretty vocal about police abuse), and I even posted this exact case in the other cop thread as an example of how cops wrongly escalate situations that don't need to be escalated (which often winds up with someone getting hurt, killed, or having legal ramifications). I'm just not a person to blindly rage and stereotype an entire part of society. All these cases we read about (while there are a lot of them), represent a very small fraction of all the stops and interactions police have everyday. The media will have you believing that cops are a band of roving thugs that are out of control just looking to bust heads, but in reality, these cases (locally I think of Kelly Thomas case in Fullerton, CA) are pretty isolated and quite small in frequency when you consider all the police and all the interactions they have. Doesn't mean that it makes it acceptable, or that this is something we have to tolerate, but most of the time, the cops are just doing their job. There are probably incidents that go unreported, but luckily because of things like this situation with this jogger and others, more and more cops are being filmed, so I would venture to guess that less and less is going unreported.
With that said, I am very concerned about certain trends I'm seeing. The militarization of our police force, the random traffic checks by certain agencies like Homeland Security, the TSA, the NSA, etc. But that's an entirely different subject for entirely different threads.
This particular case, with this girl jogging is missing a lot of info. We didn't see the actual stop. We don't see how that went down. We don't see, know, or have any idea what she said or did when the cops stopped here after their initial request. All we see is the girl freaking out with cuffs on from what originated from a jaywalking ticket. Perhaps she didn't want to give them her name. Perhaps she DID give them her name and it didn't work, or perhaps she was completely cooperative and these cops are just dicks. We just don't know all the info. This particular case DOES however reflect how a simple stop can go south if a cop is perpetually escalating the situation, and it has been further exasperated by an idiot police chief saying stupid stuff.
I'll go back to my barbecue example. I COULD be a total dick. Get everyone around the barbecue's ID. FI all of them. Cite the person claiming the barbecue and pour water on their chicken. But weighing the pros and cons of that, I want people to come to the beach and have a good time. I want them to perceive the lifeguards as a group of people that are friendly to interact with, that we're approachable, that we use common sense, that they're overall experience at the beach including the people running it, is pleasant. That works in our favor because they tell friends and their friends tell friends and we get good PR out of it. I'm not a cop, but I do have close friends that are, that I'm not just friends with, but also have worked closely with them at the beach at a professional capacity. But all of them are very mellow approaching a situation. They seek voluntary compliance. They don't push the people. The operate from the idea of dispelling information and educating the person they're dealing with about why they're being talked to. This is kind of where I learned my approach when dealing with code enforcement. I don't have a gun. I have boardshorts and flip flops. I have never felt in danger when dealing with the public and I feel this is mostly because I have this approach. Just my two cents.