Until your brain develops past the tadpole stage, I suggest you not leave the house if you fear mass shootings. You actually may still be in the larva phase in cerebral development.
If you were really concerned about saving lives rather than some political mantra, you would be better served arguing for reduced speed limits or border control.
There will be more people killed in car accidents by the end of the year than there have been in mass shootings in 40+ years. More people will die from fentanyl(most coming illegally across he border) by the end of the year, than all recorded mass shootings in 100+ years.
Also, I would not ride in a plane, car, or bus, - and stay away from dogs. They are all more likely to kill you than a mass shooting.
Hope this helps.