Is killing a police officer worse than killing a "normal" person?
Not sure how accurate that statement is in America.
Also, even with someone who religiously carries a gun as much as possible it would be unusual for them to carry a full-sized duty pistol and the ammunition that most cops do (stereotypically a Glock 22 w/ a 15 round magazine and 2+ additional magazines, a total of 45 or more rounds). Certainly some folks do but I'd doubt that number is even in the double digits throughout the entire US, excluding off-duty LE and people working security in some capacity. People who carry concealed tend to choose smaller, lighter guns and not quite as many total rounds, because ammunition is heavy (stereotypically a Kahr PM9 w/ an extra magazine, a total of 14 rounds, or maybe a Glock 26 w/ an extra magazine, a total of 20 rounds).
It's within the realm of possibility that there are "tens of thousands" of folks who concealed carry with that amount of ammunition, but I would be surprised if that was the case.
Also, even if it is that many, it's still a tiny fraction of the populace. Even in the most enthusiastic pro-gun states only a tiny fraction of the public carries on a regular basis.
America isn't the wild west. We value our right to keep and bear arms, but not that many people actually carry weapons with them. Most gun owners keep their guns at home.
The best numbers I could find [1] indicate 8 million active concealed carry permits; so at most ~4% of the adult population has a permit to carry a gun outside the home. And most of those (anecdotally) don't do it often.
[1]: http://www.nraila.org/news-issues/articles/2012/7/new-federa...
The general citizen, even when armed, will often run for his life instead.