Estate taxes above a certain amount seem to me to be a reasonable precaution against keeping large estates in family hands who didn't earn them.
This is asinine. I should have the right to pass on to my children anything that I acquire during my life. How dare you or anybody else advocate taking away my right to do this? Are you going to be the inheritance police? Are you only allowed to have what you have earned? Do you really think it is a threat to society for people to inherit lareg sums of money? In this case, you must be opposed to the lottery. Winners really haven't "earned" anything.
If you want to give your money or possessions away instead of passing them on to you children, fine. I think that is stupid but it is your right. However, don't you dare enact laws that prevent me from disposing of my lawfully earned possessions as I see fit.