I'm not a huge fan of this kind of safetyism argument. Human beings have been injured or killed by most fields of human endeavor, it's certainly unfortunate but unless Richard Serra specifically was engaged in some kind of negligence I don't see how that's really a critique. In the last couple hundred years some person somewhere has variously been killed by swimming pools, kitchens, sidewalks, windows, bicycles, etc. How many people have fallen off say a roof in the last century? Imagine if you said 'no one is talking about the number of lives cut short by roofs'. A 0% injury/death rate is not really possible