America is the only developed country this happens in. It happened in Australia once, 35 were killed. What changed? Gun laws. How many massacres have occurred since then? Zero.
It would be fine if those that don't want any changes would just pony up and say they're prepared to have hundreds of their countrymen die each decade as the price of having freedom of gun ownership.
I don't have to agree or disagree, I'm not a product of your environment. But I am able to look at the reality.