Choking can happen anywhere you are; preventing accidents from drowning and bicycling is 100% under your control (just don't swim or ride a bike). Mass shootings don't and aren't.
I mentioned relatively extreme measures that are still reasonable for the sake of argument. The point is you can greatly reduce risk from these activities without affecting your life too much (except maybe if you're a professional swimmer/cyclist); the equivalent for shootings would be to never leave your house and that has an obviously much worse impact on most people's lives.
