Thats a piss poor attitude to have.
That's what I thought. That's what Yankee Marshall advocated, playing the odds. His opinion is, odds are you won't need spare ammo. Five rounds is enough.
What if your mag fails?
What if you have multiple attackers?
What if you miss more than you assume you're going to?
It never ceases to amaze me that some people think they're going to fire one or two shots, perfect center of mass, no misses, under pressure, and stop the threat(s).