First, @AC Staff Sergeant: Your CV is cool and all that, but from a Marine Sniper who has a brother who's a BUDS instructor and another that's a SEAL, my wang is bigger and purplier than yours.
Second, as a person who trains security personnel and who has an uncle who owns a small security firm. (He provides personal and property protection to professionals.) The campus cops were right to do what they did.
Is this an ideal situation? No. However, there are more than a few risks that others have touched upon.
1. It was an unsafe situation.
I have worked a lot of different events and a lot of different venues. Never, ever assume that someone who is 'acting out' is non-violent and unarmed. I haveseen several people seriously injured or killed by bypassing this assumption. Including one stabbing by pencil that resulted in brain damage and loss of sight.
No one has the right to force their will on a venue. Period. If you are asked to leave, do so and protest on public property. No, the Uni meeting room is not public property. If you do not leave, you are at least an annoyance, and upon further resistance, a threat. As you are all aware, as the need for someone to conform to a behavior becomes more urgent the conflict will escalate.
Regarding the physical stature of the security guards, had this confrontation been in the parking lot it would not have been prudent to tase the gentleman as tacticly it would have been safer to distract, restrain, and disarm him. In an environment where the person can come in contact with several people quickly and you cannot effectively surround him w/o coming within stabbing range, I would recommend the taser to someone who wasn't comfortable with risking severe injury to themselves and the perp. If you engage without the taser and the perp attempts to stab you with the pencil and you break his arm in self-defense, then you may be liable, depending on the venue and the perception of the jury. In this case, there could be little confusion as to what actually happened as the security professionals kept their distance.
If you want to protest something, there are far more effective and safer means to do so.
Personally, I would rather walk up to the guy, tell him to stop making as scene and leave quietly or I'll break his arm and drag him out, but I'd be sued out of my pants for that.