That's a horrific story -- a guy wandering around with a crossbow doesn't attract any attention???? -- and the odds are that carrying a bazooka wouldn't have helped the victims.
I live in a quiet little town, I and most of my neighbors are retired, and I don't anticipate being attacked in my house or yard. That said, I pocket carry an NAA Pug all the time at home, and am never more than a few steps from the 1911s in my bedroom and living room.
The odds of being attacked are small, but when you're dead or maimed because you were unarmed, the odds don't matter. We have the right to be armed in this country, and I'm taking advantage of that right.
"The welfare of humanity is always the alibi of tyrants." Albert Camus