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"A simple announcement to the effect that there was an armed and dangerous individual, possibly still on campus, sent immediately, could have saved lives. It doesn't matter if the campus is large, or the security force is limited. Students and teachers should have had that information, they would have been extremely alert to any thing suspicious, and it could have made a difference."
No, it's very unlikely such a message would have saved lives because the armed and dangerous individual was also a student who, was carrying concealed weapons. He also called in a bomb threat to further confuse the situation after killing the two people in the dorm. Along with that, he chained the doors of the Hall shut and waited until the other students were in enclosed spaces with limited escape routes, classrooms, before he started the rest of his rampage. It's wishful thinking that any announcement earlier than the one the university made would have made a difference.