Your Move, South Dakota

I knew it couldn't be long before Texas fought back against South Dakota's efforts to steal the Lone Star State's second amendment superiority.

Texas Poised to Pass Bill Allowing Guns on Campus
More than half the members of the Texas House have signed on as co-authors of a measure directing universities to allow concealed handguns. The Senate passed a similar bill in 2009 and is expected to do so again. Republican Gov. Rick Perry, who sometimes packs a pistol when he jogs [emphasis mine], has said he's in favor of the idea.
The article highlights an idea that seems right to me, but maybe this only reveals my bias:
Supporters of the legislation argue that gun violence on campuses, such as the mass shootings at Virginia Tech in 2007 and Northern Illinois in 2008, show that the best defense against a gunman is students who can shoot back.

"It's strictly a matter of self-defense," said state Sen. Jeff Wentworth, R-San Antonio. "I don't ever want to see repeated on a Texas college campus what happened at Virginia Tech, where some deranged, suicidal madman goes into a building and is able to pick off totally defenseless kids like sitting ducks."

Until the Virginia Tech incident, the worst college shooting in U.S. history occurred at the University of Texas, when sniper Charles Whitman went to the top of the administration tower in 1966 and killed 16 people and wounded dozens. Last September, a University of Texas student fired several shots from an assault rifle before killing himself.
I once got a tour of Austin from a friend who's lived there all of his adult life. As we cruised though the campus of UT, he stopped the F-150 to point out that clock tower. Then, casually (and without a hint of bravado), he pointed over at a tree and said "...and that's where I was layin' under cover with my deer rifle, shootin' back." Needless to say, I was astounded.  I got the impression, though, through a series of follow-up questions, that there was nothing unusual about it at the time. Lots of guys had hunting gear in their dorm rooms, and when they heard all the commotion and the “SI-reens” from the police cars, many of them took up arms to fight back. 

But the VT incident was different – the psycho killer in that case was totally exposed to anyone who might be prepared to shoot back. He just knew no one would be armed. 

And every incident will be a little different from the ones before it, so it's not entirely useful to speculate about what might have happened if any number of variables were changed prior to the fact.

The point is, at least in my mind: gun laws don't seem to keep the unlawful from using guns to do harm. Would reasonable changes to the law at least permit the lawful to minimize the harm that can be done by the unlawful?