CHAPTER VI. GUN PURCHASE AND CAMPUS POLICIES
"Virginia Tech, with approval of the state Attorney
General’s Office, had banned guns from campus
altogether."
That didn't stop Cho. In fact, it only ensured his victims were denied one of the most effective methods of fighting back.
The logical conclusion is John Woods and his fellow travelers want to keep the current laws prohibiting legal concealed carry in Texas universities to ensure victims are unarmed, so criminals and the criminally insane can do their thing without resistance.
"The
campus police said that the probability would
have been high that anyone emerging from a
classroom at Norris Hall holding a gun would
have been shot."
Maybe. Eventually. On the other hand, the police didn't shoot Cho.

Seung Hui Cho had free reign in Norris Hall for more than ten minutes, and police didn't find him until half an hour after his first murder in Norris Hall. Also, his murders in Norris Hall started more than two hours after his first murder of that day.
Even if the campus police are correct, that only means a CHL shouldn't draw their handgun and go chasing a bad guy. Take a defensive position and force the bad guy to come through the fatal funnel to reach you. Use cover and concealment. Unless it's a bottom tier school, I assume a CHL on campus is as smart as a CHL in a Home Depot, Starbucks, Chucky Cheese, or any other places a CHL can carry now.