This is why the founders of our country included or assumed the individual right to keep and bear (carry) arms (weapons) in the constitution of the nation, and of each of the founding states.
Don’t be surprised if this non-massacre of college students doesn’t get the same duration of coverage in media and politics as the massacres that were not prevented by the heroic actions of armed individuals. This example demonstrates conclusively the benefits to society of this particular freedom. Unfortunately, there are some who would try to win the argument by depriving the public of information like this, rather than letting the fully-informed public form its own opinion based upon the facts.