'Apparantly gun laws weakened since Columbine. '
Gun laws vary by state. So generalisations like this are just that.
The 'right to bear arms' was put into the Constitution as a direct result of how the colonials were treated under British rule.
There's NO WAY those who drafted the Constitution could have foreseen how things would become 200 years on.
I lived in Littleton at the time Columbine happened.
Comparing what occured there to what happened to VA Tech is like comparing apples and oranges.
The VA Tech campus is enormous by British standards, although many universities have an even larger campus. My alma mater is double the size of VA Tech, with nearly double the number of students.
We must also remember that a state university is actually public property, security has to be done in accordance with this.