Tradeoffs have to be negotiated by society. Accusing some of being "willing to accept the deaths of children" in that context is an abusive argument.
It’s terrifying to think about something happening to my daughter but I know if I don’t give her the opportunity to learn about responsibility and safety on her own I’m not doing my job as a father. Having a playground or similar option (hiking trails, rustic camping, etc) to explore this is a plus and IMO part of what we need in society and less safetyism.
So much is just out of your control, accidents happen - be it for kids or adults.
People are obviously not advocating for creating deadly play spaces for the future generation, but we did manage so far with the decent enough security standards.
Kids hurting themselves is normal, thats just part of learning their limits. I dont know how many times I fucked up and caused myself (non-critical) damage - did I do the same stupid mistake twice? nope. I could've died or seriously hurt myself a lot of times would I have just been unlucky, but I wasn't - cause there was a very slim chance anything bad could have even happened. Climbing trees? never slipped or jumped off a height that wasnt harmless. Cycling around? Never fell bad enough to do more than scrape my skin. And so many more instances of things going bad, but working out fine