It's getting a bit ridiculous. I want to see a statistic about all the lives that guns save, or all the lives that could have been saved, if someone had a gun, as in the many school shootings around the country lately, but I know I'm not going to find it, because, as we all know, guns are scary...

This kind of thing boggles the mind.
-ahem-
Lives saved in school shootings by firearms since 2010 is unknown - I could not find a single example of a school shooter being killed by anyone other than themselves. I found a single example where an unarmed teacher was potentially responsible for shortening a shooting spree by confronting the gunman, who then shot himself.
People who have been murdered by firearms in school shootings since 2010: 105
Imagine if you will, that these guns hadnt been so freely and lazily available? Take for example; Canada - Since 2010 there have been zero school shootings, similarly in the UK. France has seen 19 firearm murders in mass shootings and Norway saw 68 peoples lives end in a single incident in that same timeframe.
I can assure you, as a politically aware and intelligent human being, the United Kingdom has no interest in reclaiming the USA as a colony, we can barely support the few scattered islands we currently think of as an Empire.
The intention of the second amendment is to allow citizens to defend themselves from the military, should the government use them to act against the will of the populace. Tell me, how will your semiautomatic rifle protect you from a drone you can neither see or hear launching a missile which levels your entire home whilst you sleep? How will your handgun protect you from an armoured vehicle with over two feet of armour designed to protect it from anti-tank shells?
I know that shooting a gun is fun, makes you feel powerful and safe but here is the thing, unless you live somewhere that a coyote has got into my house and eaten my dog (or similar) is a realistic threat, then a gun is completely unneeded. It is like using snow chains in April in New Mexico, or wearing a condom to do your laundry; these things are tools for specific tasks and have no practical purpose outside of them.
Guns are tools for making things dead, that is the only thing they do.