Although it might seem a bit selfish to some, there is also an economic factor to consider; folks like that essentially want us to foot the bill for their self defense, by having "extra" guns and ammo on hand to loan them.
I am thinking more like a failure to plan at all. This brings the old adage out;
...A failure to plan on your part does not necessarily result in an emergency on my part...
Anyhow had a conversation with an avid anti at work about this. He knows me so he stuck by not wanting a gun figuring there were plenty of cops in the area to protect everyone.
I told him that the bad guys had started at least one gun fight with the police and one had gotten away for a period of time after that. He did not really have an answer for that.