As you read in John Farnam's quip "Age of Terrorism," there are other things you can carry every day. Check out this interesting option from guys that understand readiness.
Major events, like Vegas, induce thoughts of what you would do if placed at the scene. For me, I found one item that

I’m not carrying currently that could save my life or others in case of emergency.
Medical Kit/Tourniquet – We train constantly using guns but rarely venture outside the box. Great medical kits aren’t hard to find, but if carried saves lives. Blue Force Gear produces quality packs that have everything you need to render aid quickly.
Here’s a slim first aid kit that is easily concealed. Think a kit is too much? Why not, carry a simple tourniquet. Here’s a good one, and it won’t break the bank.
Of course, if you’re going to carry, you better train on how to use the equipment. ~KJ
Kevin Jarnagin
Kevin Jarnagin (KJ) hails from Oklahoma, but quickly established Louisiana roots after joining the Gun Talk team. KJ grew up as a big game hunter, and knows his way around a bass boat. Whether it’s making his way to British Columbia for elk or training with pistols, Jarnagin always seems to find a gun in his hands and adventure on his mind.