First off, how do you know it's a shooting victim?Obvious mistake I made was not getting the weapon before looking out the window - what if a shooting victim was running towards my house for aid followed by his attacker? etc. etc.
Second, what responsibility do you have to come to their aide? You have a gun, what if someone was chasing the "victim" and you were forced to shoot the aggressor?
The point I'm trying to make, is you do not know who the players are, or their role. Unless you are 100% certain of what is going on, you have a responsibility to keep your weapon silent.
I look at it this way, I have taken steps to ensure my safety. Any shooting victim you encounter, that is an adult, has those same opportunities as I. Why then should I assume that safety for them? If they were negligent in their responsibilities why should I interfere with Darwinism?
Other than calling 911, if I am off duty and you are not a threat to me and mine, or an identified LEO, the most you will likely get out of me is a call to 911. I can hose the victim's blood off my porch in the morning. I have a greater responsibility to my family than I do to a stranger in need. Why would I open my door, possibly giving a violent criminal actor access to my loved ones? Life ain't like the movies and I ain't John Wayne. There are no "re-takes" or do-overs.
If my comments seem cold and callous, that's because I've learned how precious my life, and the life of my loved ones is. I don't care about your life, except as to how it impacts mine.