My guess is that an overwhelming majority are LE situations. Trying to find as many examples of cases in which a law-abiding citizen targeted for a crime other than specific assassination was subsequently shot, stabbed, or beaten to death after shooting their assailant would be a lot tougher. In fact, the private citizen rarely even needs to score a hit to end the encounter.
The guys that "soldier on" against cops do so because they know that the cop won't stop until the BG is dead (or otherwise disabled) or locked up, neither of which is especially appealing. The BG that targets a citizen who then fires on him (with any caliber) knows that simply breaking off gives him a far greater chance of not getting dead or locked up, so off he goes. His original target isn't likely to pursue while radio-calling for many more armed citizens to join in.
I'm also just not seeing all the reports so often mentioned here of doped-up, zombie-methhead-whatevers that keep coming, raping, murdering, and pillaging after soaking up multiple handgun rounds fired at them by private citizens.
Of course, I'm not advocating anyone carry the smallest and weakest firearms for self-defense. We all know the advice of "carry the best-performing firearm-ammo platform you can practically carry and effectively deploy and shoot" (we need not tell years-long smokers that smoking can be harmful to their health; they know it already.) What I am advocating is that the rest of us refrain from bothering or disparaging those who are clearly not clueless about it for making their own personal choices.