A bit like your deer story, my sister and I stopped along a highway one evening because a woman in an SUV was holding her phone out the window, taking a photo of something -- which turned out to be an owl that she hit.
We asked what we could do, and she said, she didn't know, she was on her way home and drove off, leaving the bird in the roadway. It was clearly stunned, and pushing common sense and self-preservation aside, I grabbed a towel, wrapped it around the owl and moved the poor thing well off the road.
In the meantime, my sister called the DNR and two officers showed up. One, well-gloved, warned us to keep our distance because the bird was dangerous. Uh, okay, I won't pick it up again.
He determined that the owl probably just glanced off the side of her mirror, hadn't broken any bones and likely had the wind knocked out of it. There was no blood and it started getting more active, so he moved the owl into some higher grass and left.
We drove back the next day and were relieved not to see an owl corpse. I will always hope the owl recovered. I don't know how the first driver could hit it, take a photo and just drive off.
I'm proud of you for being a good human and doing the right thing. The world needs people like you.