So the government should get it (in the form of taxes)?
Government is certainly a flawed organization. But we currently trust them with all our other tax dollars. I don't see any reason to hold estate tax dollars to a different standard than any other government revenue.
The point is: government is not deserving either, so the spoiled kids angle is bogus.
Pointing out that the government collects other taxes is simply not relevant to this aspect of the conversation.
My point is that we as a society have entrusted government specifically with the job of redistributing wealth to better society and that makes them the better of bad choices.