There is no imaginary place in the sky where you can look down after your death and see people happy because you left them money or less stress.
Live life for the present and future. Not for the nothing.
Sure, game theory might throw a spanner in the works for the now and future-
- Your partner having a will / life insurance might be important, so you have to get one for quid quo pro.
- You might be stuck being stupid and it'll help you relax. Humans are weird.
- Stupid people might judge you or smart people might sham you (Since wills probably benefit society)
But this crutch we can get, that in death my kids and wife will be happy, a false safety valve, can be more destructive to your life than the reasons above.