Apologies for late response.
Ok, there were a few things that struck me about this. Firstly, how did the attacker obtain the security passes needed to access the building? If, as MrBlonde suggested, he was part of the security detail then admittedly this would be relatively simple. Secondly, once the assailant was apprehended, is it professional to then publicly beat him while he is restrained in full view of the media? Not only that, but allow onlookers who didn't appear to be part of the security team to also get involved in the assault? This occurred both in the conference room and then again in the lobby area.
Once he was restrained and subdued, shouldn't the priority have been removing the attacker from the venue? For all we know, he could have been wired with explosives. This may have lessened the chaotic effect of the subsequent melee which ensued.
Furthermore, at around the 0:27 mark, a gun is shown on the floor. Yes, there were security team members standing over it but it wouldn't have been difficult for someone else to pick it up. I would have thought that covering it and putting one foot on it would have been a better course of action.
I won't even comment on the part where his trousers were pulled down...?!?
Of course, I fully appreciate that all of this is easier to judge with the benefit of hindsight.
Thanks for your input MrBlonde, Sergic08 and Sabre.
Thanks also to JOHNPIQUE for your highly intellectual and mature response. As stated in the first instance, I openly admit to having very little active CP experience. And as there is not much info on your profile, I can only assume that you are the fountain of all knowledge. So I'll be sure to run anything else past you before I post in future. Whilst you do make a valid point, perhaps you could have presented it in a more constructive manner.
I can only comment on the evidence in front of me. I didn't pretend to know all the details, I was only referring to the clip in question and giving my amateur opinion. This is a forum, I encourage people to disagree and debate with me, but please bear in mind the manner in which to do so.
Thanks all.