I note that...
The sensible, logical, and calm well-thought-out arguments are put forth by people who own and carry firearms (or would like to) for protection of themselves and loved ones, and the emotive rants with exclamation marks that pick up on nonexistent flaws and flail at them with reasoning that doesn't stand up to one second of rational thought are the people scared of firearms. Hmmm.
For example. You have a gun about your person. As reasoned above, that means no-one can approach you by any level of force for they face an equal amount of force in return. So the argument against that, apparently, is "ahahaaaaa, but but but, the mugger will immediately shoot you in the back!!!!111one". The presupposition there though is that if you weren't carrying a firearm, the mugger would what, exactly? Your own rule, *your own example you typed in* shows that they are psycho enough to shoot at an *obviously armed* person with no provocation just to get an MP3 player, thus _risking their own life_ for cheap consumer tat. So what 100% they aren't going to do for someone obviously unarmed is switch from someone so dysfunctional and psychotic that they would pretty much randomly shoot anyone in the back for no reason, to someone who'll ask nicely for your iPod and maybe push you over a hedge and run off if you said no. Good grief, give me strength.
What they'd most likely do is avoid the armed person like the plague and go shoot someone unarmed - easy life.
And a million people marching on Westminster means the police have to get out of their APCs and not use guns? Christ, have you heard of China? Tianemen square? And indeed British Apathy? Millions indeed, how I cynically snort. Nope, you'd tut about it and get back to your surveilled 24/7 front room (hey - if it saves one life, think of the children, if you have nothing to hide...) I could go on but I suppose I'm either preaching to the converted or trying to use reason and logic against closed-mind emotionalism (pretty much how Blair got into power on the back of dead kids, you lovely anti-gun people you, I hope you're proud).
Honestly I wonder what planet some people live on sometimes. Think your argument through first, or you just sound like someone who believes guns are the root of all evil and just by touching them you turn into a killer or something. If you recall there are armed police and armed forces and somehow they avoid going on the rampage at the drop of a safety catch. Oh no wait - the shining examples of "the only people who need guns" are actually quite prominent in the "shooting people they shouldn't" stakes. Gosh, another poorly thought through statement shot down in flames, this job's too easy.