Because they're horrific tragedies that we should be fighting tooth and nail until they're extinguished and nobody ever has to deal with them again. They should be consigned to the history books.
> Aging is a process of coming to terms with death.
Aging is a biological problem that we continue to debug. And nothing should make us "come to terms" with being obliterated. If someone is attacking you, you don't "come to terms" with your impending injury or death, you fight back.
When a problem has thus far been a seemingly immutable property of life, it can be difficult to envision a world where that property has been overcome. It can be difficult to even see it as a problem. And it's understandable that people's first instinct is to somehow justify the status quo, that there must be a good reason that 150,000 people die every day. One step towards solving the problem is to reset that expectation, to get people to recognize the problem as a problem rather than a "fact". In the meantime, progress will continue to be made by people who see it as a problem, but far too slowly without more widespread support. Every day longer it takes is 150,000 people lost.