I've been to 2 of the parks in the list, Yosemite and Grand Canyon, but you are correct, I only wrote about Yosemite and not Grand Canyon. Maybe I should write about that one this Sunday.

Generally the parks in the States are very well maintained and very safe. At least that's the case for the ones we've visited. We never look at deaths that happened in a park and that's never part of our decision to whether visit a park or not. We visit a park because we want to visit it, and that's pretty much our whole decision making process. That said, we usually travel as a family, with young kids. So we tend to stick to more easier hikes and activities with less risk, because the kids are not physically capable of doing very physical challenging activities. I mean, if you go to Yosemite and free solo El Capitan, and if your name is not Alex Honnold, chances are you will fall and die. I think knowing what you're capable of and don't do something you know you can't do is a great way to stay safe.