Except we all make trade-offs in life, right? For you (I will take a guess) the trade-off stopped at .45 caliber. But someone who insists on carrying a pair of Uzi's could say that you didn't do all you could. Someone who carries a .44 magnum, a Bowie knife and took the time to master the arts of kung fu and Filipino knife fighting could say you didn't do all you could. You see, we each must weigh the odds of ever needing a gun and in what circumstance, the benefits of carrying what we choose, and the drawbacks of our choices to arrive at a decision we deem appropriate for ourselves.
So no, it doesn't seem contradictory to me at all. We must live with what we choose. What seems contradictory is when people don't think about their safety in today's world, and what they can do to protect themselves. But as far as what they decide, as long as they thought about it, and even if I strenuously disagree that their choice is adequate, I say more power to them.