I don't know how it works in the US but there are definitely countries where after x years of disappearance you are legally declared death. And, yes, some people who are still alive and, say, left the EU for some country in South America, are still alive. Which is not my point. My point is that for inheritance purposes etc. there are countries who'll declared you death if you don't give any sign of life for x years.
Then, for example, consider n = 5, k = 3 - if any 3 of 5 selected friends decide the trigger has been met, they can work together to decrypt the information. But a group of 2 of the 5 could not - reducing the chance of it leaking early if a key share is stolen / someone betrays or so on. It also reduces the chance of it not being released when it should, due someone refusing or being unable to act (in that case, up to 2 friends could be incapacitated, unwilling to follow the instructions, or whatever, and it could still be released).
Right now, as an individual, you'd have pretty small number of trusted N's (from parents definition). With some organization, maybe you could get that number way up, so possibility of destroying the entire scheme could be close to impossible with rounding up large number of the population.