There's a difference between knowing that a certain number of people are statistically dying right now vs knowing that 5 specific people are currently dying in a specific way.
So most developed societies, for instance, are OK with people dying in mangled steel cages on roads because most people in those places think car-based societies are worth the cost in lives.
US society in particular is OK with people dying in mass shootings, because American people think having access to guns is so important.
But if a bunch of people die in an aircraft crash due to negligence, suddenly it's different because that's not an acceptable loss: it was preventable. Mass shootings aren't preventable in the US because most people there value "gun rights" over these deaths, just like the US and many other places value car culture over the deaths caused by cars.
[0] https://www.texastribune.org/series/uvalde-texas-school-shoo...