Inheritance tax should exactly 0% , since the govt already taxed that money when it was originally generated. WTF is up with taxing the same revenue twice?!
The point of this is to safe guard the inheritance. You some times have to bend with the wind, by giving up a little you save a lot.
If the gulf between the have's and the have not's grows too wide, they just might TAKE it all.
Of course if you really do have a fortune to leave, you are free to try something else.