Isn't reasonable suspicion an opinion that is based on an officer's experience and training? Therefore it gives an officer the legal flexibility to ask anyone for ID a legal command as long as he could give a "reasonable" explanation of why. I highly doubt that most officers will say "May I please see your ID, but if you don't want to it's OK I'll just go away now." Or "If you let me see your assault rifle, I'll show you mine

" Perhaps all that an officer would really have to say in court to establish his reason is "He looked suspicious, so I asked for his ID," and the judge thinks "Well ... that's reasonable enough, he looked suspicious." BTW reasonable suspicion was NEVER brought up when I faced the judge when I was arrested in 2004 for not showing ID, it was just simply assumed (which is probably still the norm).
In the second video, the officer requests for their IDs to check and see if they have the legal right to carry their firearms (background check for felonies); which sounds like a reasonable suspicion - they could be unregistered or felons. However they refuse to showing their IDs, so now the officer cannot verify their legal right to carry. It is at this point that I do not see why the officer could not arrest them if he wanted to, because he already established a reasonable explanation for his suspicion. He could easily say "We received several calls from alarmed citizens of Mr. Smith and Mr. Wesson who have been seen walking around town carrying assault rifles. When I approached the suspects and asked them to provide IDs to verify their legal right to carry they refused; which made me suspicious of their reasons for carrying openly in public. Throughout my years serving as an officer, I commonly come across felons who are in illegal possession of firearms; therefore, after they continued to refuse to comply and provide their IDs after several more attempts, I placed them under arrest to ensure the public's safety."