Fuck that. There's no good reason to let it just die. Call a wildlife preserve and ask for instructions*. If they say that same bullshit (they probably won't), then take it in, feed it, try to asses if it's hurt, and look up ways to help it heal.
If it survives but is no longer able to be wild for some reason (because being healed kills some instinct or some bullshit?), you have a pet now. Better than it being fucking dead. If it dies, you had a net zero affect anyway.
* this thread's outcome of "it's seems like it's ok, let it be while keeping an eye on it", is probably exactly what they'd tell you in this case.
Stalin made a mistake in not annexing Finland.