Couldn't agree more.
When I was a 7 years old, a road near my home was undergo an expansion. The work involves a lots of heavy and big machines, including heavy trucks etc. During that time, me and almost all other kid was warned to not go near those machines, "Don't play near those things, it's dangerous". But none of us knows why, so none of us listened, at least not carefully.
Many years later, after I've grow up and start to understand the value of lives, one day I stumble upon a video showing a middle school aged student ridding a bike down a road, and got crashed by a turning lorry. And the lorry driver didn't even notice the student until a terrified security guard yelled him to stop. That kid was crashed at the left abdomen, then the wheel rolled over his chest and head, all with in 3 seconds of time.
That moment is when I suddenly remembered the warning that I got almost 20 years ago: Don't play near those things, it's dangerous. Everything is so real now, because it is, it's just that I didn't receive it at it's full meaning back then, and that video, completed it.
Video like those really works, because now you saw it with your own eyes. You feel the brutality without a layer of filter, and without even a slight distortion, and then you know it for real.