When you're dead, you don't need money (unless you want to buy cryogeny contract, but you'll pay for it when you are living).
If you pass on this money to your family, 2 things happen : - you skew the odds in their favor. Other people who might be equally capable and intelligent won't be able to compete with them. that's a class society as in medieval europe, where wealth in inherited - you incentivize their laziness, and encourage them to destroy their life with this unearned money. you basically ensure they won't be able to grow from normal bad experiences. trust fund kids give a glowing example.
As much as I hate giving money to a government, I'd rather see my money there when I die that either or both of these 2 things happening. The alternative would be earmarking that money to debt reduction, so that at least it wouldn't be redistributed. That could be a good alternative.