Whole point was neither should be impeded... Living in a society has risks. Overall it looks worse recently, but deaths from mass shooting are still well below just Chicago's murder rate:
https://www.washingtonpost.com/graphics/2018/national/mass-s...
https://www.cnn.com/2018/12/31/us/chicago-murders-drop-2018/...
Personally, I'm not at all afraid of gun violence (perhaps because I've used a gun). Bombs, poisons, etc. and the like are way scarier, as they can kill way more people. Honestly if the occasional mass shooting happens every few weeks, it's a pretty low price to pay (as callous as that sounds).
With scanners and what not there's such a high potential risk of abuse that it's not worth it. If someone randomly elected can decide to imprison million of people they don't like. We probably don't want them to have said technology already in place (and probably want guns).