Almost all of that is inner city gang crime. And looking at those reported incidents, most of them failed to kill even a single person. The big random shootings that make the national news are extremely rare and make up a tiny percentage of all murders.

The deaths from terrorism work out to around 200 per year. Which is on the same order and possibly greater than the mass shooting deaths. And that doesn't even take into account the massive amounts of money and effort we spend on keeping that number low.

Which is still incredibly rare, considering the size of the country. I think the point being made is if you care about human safety, things such as alcohol, automobiles, cancer, dementia, etc cause vastly more deaths and injuries, but don't get the same mind-share.