This falls to the "acceptable ramifications" ruling that I've realized. These deaths are, in the grand scheme of things, acceptable and insignificant because they're so rare. They don't matter, at least not enough to have any impact on how society operates. They will continue to happen because society has given its silent endorsement. I don't mean to make it sound like we like these events happening, by the way. Just that we are willing to pay this price for our rights. Whether or not that's morally acceptable is ultimately up to the society that it occurs in, and if it says yes, then so be it.