Having soon a lot of real gore from a relatively young age, I may be calloused but in a good way - when something really fucked up happens that actually involves gore, death, violence or really scary, unpredictable or urgent things, I am quite calm and am able to handle situation much better than people who feel like vomiting at the sight of blood or a worm on an infection. Sure, some of the stuff I saw was in my mind for days, but I got used to it. Not to say I'm desensitized to it in a way that makes me not care about it. I'm still very empathetical to anyone who's suffered even the smallest of wounds or hardships.

I was exposed to violence first from movies (my parents let me watch anything and I thank them for that), then from shock sites, 4chan, liveleak, /r/watchpeopledie and so on.

I think I've really internalized how dangerous the road is, how dangerous machines are, how horrible war really is, how you can get killed by just saying the wrong thing, how there's always a chance you can die from anything at any moment. I still sometimes cross on reds and mouth off at someone who might be dangerous - I'm not scared of anything to an unnecessary degree, although being "scared" in a rational way is good IMO. I think I have a better way to assess risk than the average person, though.

I found some of the PSAs and they involve mild injuries or death without the injury itself:

https://www.youtube.com/watch?v=mKHY69AFstE

https://www.youtube.com/watch?v=HeUX6LABCEA

I bet if you show kids actual footage of road accidents, it will burn into their memory for a few days, long enough for them to think it over a few times. The PSAs are really forgettable here.

I really like this PSA about safety conditions as it made me recall it for a few days:

https://www.youtube.com/watch?v=kOk2Akqb3CI

Now I'm actually really careful about any type of spills or grease in my kitchen even though I rarely move around big pots of boiling water.