It might have to do primarily with how the question is asked. If you say "what information about the future would you impart to your past self if given the chance", then that opens it up to broadly changing future events. But "what advice would you give yourself" presents it more as what would you say to benefit yourself the most.

It's also possible that those that have had people close to them die in easily preventable ways may think of it differently. Having someone important to you die in a car crash is different than having them die of old age or of cancer or some genetic disorder, which are broadly either unchangeable, unknowable of what causes it for sure, or both.