Being able to defend yourself with nothing but your flesh and your wits is a very important, often overlooked skill.

Mechanically speaking, shooting someone dead at 20 paces is relatively easy.

Breaking your attackers windpipe at a 45 degree angle one-handed is far more difficult. It's not an instant-kill, and they may actually survive it - but its a hell of a deterrent towards any further action from them. They wont be able to shoot you, because they're in panic-mode, oxygen deprivation happens fast when air cant get to the lungs but blood can.

My point in this is simple. If you are untrained in hand-to-hand combat of any kind, GET trained. At least a little. Flailing your arms about like a Kardashian whose creditcard got cut isn't gonna save you from fuck all.