most shootings here involve illegal guns
Most illegal guns were once legal guns.
and those that shoot themselves probably didn't need a gun.
Those shot with their own gun didn't need a gun either. look at just how high the stats are for those shot with their own gun rightfully defending their property. Your odds aren't good.
Here in Texas, if someone comes into your home without permission, you automatically have the right to do what ever is necessary. This has happened several times where the home owner killed the intruder.
I have a strong belief a man's home is his castle too. The law here says reasonable force, I'd guess your law doesn't differ too far from that. Pull the trigger and your up to prove your actions were reasonable. A good lawyer can make what is reasonable sound anything but reasonable.
The cops in most cases don't do anything to the homeowner.
Most cases? Better hope your protecting yourself from someone who isn't well connected.
People really need to look at why they want to possess firearms? Sure there are legitimate uses, but the self protection BS doesn't wash, it's universally proven not to work.
When I've needed it I've had access to a rifle, I've got a circular saw that will cut your head off quick smart too. Both are tools and both are sensibly kept locked away safe unless needed. There is no good reason to have things that can kill or mame at arms length all the time.
Ready availability of firearms just escalates the problem, the social misery and paranoia. Same applies at a national level to armed and ready warheads. It's unnecessary and borderline insanity.