Maybe you missed the part where I *literally* almost got arrested just for holding off a dog from actually attacking me with a knife? The cops were in my yard and told me they were there to arrest me.
Had the dog bitten me and I had killed/injured it in self defense i would absolutely had been arrested. Even if eventually found not guilty of anything, it would have cost me at least $10k to get to that point. That's just the financial cost: there would be tangible work/marriage/other damage that a price could not be put on.
Here in Canada getting sued is the least of our concerns. It's the "justice" system that is the real problem - once the cops are involved *everyone* is a bad guy and punished by process if not by penalty. Sad really.