There is no evidence that properly trained and armed private citizens would do a worse job than government "law enforcement" personnel in enhancing school safety.
Things like forks and washing machines start out as "luxury" items for the rich. But thanks to markets, these goods, over time, become more and more accessible to everyone.
College towns like Auburn, Alabama are booming with more luxury apartments and seemingly more of everything else, too. But the story really began far away in Washington, DC where the Federal Reserve targets interest rates.