Saying "you don't have a right to pass on your property to your family" is the opposite of high trust. I'll grant that the moral answer beyond a certain point is to limit your children's inheritance to what will give them a comfortable life, and then engage in philanthropy a la people like Andrew Carnegie.

But claiming the government has to force people into this is low-trust to the extreme. It's saying "we're going to take these things we already taxed you on, because you can't be trusted to use them responsibly and we can."

You can't regulate your way into everything. Good government can only exist alongside the unwritten rules that made people like Carnegie decide that the right answer was to give their wealth away to the public.