Why should I say something like this?
If I had to enforce the arrest of a fleeing suspect by the use of a firearm, I think it would be reasonable to aim for the legs.
If I was attacked with a firearm (or someone lunged at me with a knife at short distance), it would be easy to explain why shooting at the attackers legs was not an option.
I can't remember one single case within the last ten years over here in bavaria, where an officer was convicted for shooting (and killing) a suspect. Especially not in self defense.
A problem over here is not the law, or the court system. It's the kind some politicians and the media deal with police use of force. And I guess this is not much better over there in the US.
As an interesting counterpoint; police in Norway have been unarmed save for a gun in a lockbox in the patrol car. Due to recent threats all cops have been armed, and though ostensibly a temporary measure it is likely to be permanent. The Norwegian police have also asked to be able to use HP ammo, due to overpenetration concerns. Some of the tabloids have been screaming that they are asking for "Hague-banned ammo", but overall they seem to be getting what they are asking.
Not a chance. Courts have almost always sided with reasonable police actions (though that is a dangerous word to define) and have, if anything, expanded lethal UOF in some ways compared to the rules that existed pre-Graham/Garner. If nothing else, look at nyeti's comments. Yes, major segments of the public go nuts when they see what seems like excessive force or "unfair" force, but communities also rally 'round the flag when an officer is severely injured or killed in the line of duty. The only way "shots to the legs" will become a requirement in the US is if a significant segment of department UOF experts declare it a requirement because until then, it's not a normal and reasonable police practice.