You have handguns in Canada!
The whole "45 doesn't shrink" saying is a great tagline but doesn't reflect the reality of any type of self defense shooting. For one, only hits count and you need ammo to make hits. As so many cop shootings show, your accuracy will tank when in a self defense situation. So if you hit 30% (at best) of what you're aiming at in a SD situation that give you 2-3 in hits in a 1911 and 5+for a similarly sized 9mm (like a CZ-75). Capacity, all other things being roughly equal, is always greater with a 9mm. We will all miss at least a few shots when needed at a critical time. The biggest thing is not being dry when you need another bang. It's why nobody carries a .357 magnum revolver any more (which actually has more kinetic energy than ANY .45, by a long shot).
Second point, the energy (what actually kills someone) is pretty much identical for most .45 and 9mm loads. The .45 is large and slow and the 9mm is smaller and faster. I have yet to hear anyone argue that a smaller .30-06 bullet will do a worse job than a .45 JHP. Again, the ENERGY is what kills things.
I'm not really trying to change anyone's minds but I think that it will hopefully open some people's eyes to the fact that there have been rapid changes in projectile technology courtesy of the CCW crowd. Just because the old timers had .45s for pistols and .30-30s for deer rifles doesn't mean that they were the best, just the best at that time.