Maybe you can take him to a center where people are recover form accidents whit power tools.
Or take him to a center for hearing loss?
Maybe you can let him see what it do when there is no protection/

I realize it sounds nutty, but as someone that grew up in the last generation without all the play time safety devices, somehow most of us made it thru childhood without helmets, knee pads, elbow pads, etc for skating and bike riding. I think at times we wrap our children up too much in cotton so they can’t get hurt, but getting hurt at times is what helps to learn safety and life lessons. I know when I got a use bike as a kid, if my mom would have had to fork out for a bike helmet as well (I don’t think they had been invented then) I would have never had the pleasure of learning to ride a bike and would have been denied the fun of all the hours of bike riding I had.

Safety items for a home is such a tiny part of the all round cost of the house there really doesn’t seem like much reason not to have them, while safety things for our children can equal or be more than to items themselves and to not have that bike or roller skates without the safety devices can condemn poorer children to never having those experiences at all, and with that the gap between rich and poor grows wider. And yes I realize just how precious our children are.