In Israel all persons carrying firearms are legally obligated to run towards the shooter/terrorist and engage. Some heros like Ari Fuld even do it after being fatally stabbed. That is why there are no mass shootings in Israel and even multiple well armed terrorists are taken down in seconds by civilians. However it requires a communal obligations attitude to guns rather individual rights.
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I don't think it would require communal obligation. The issue is with the laws that only hinders law-abiding citizens.