Who are you to say what someone will do with the money they inherit? They can invest it into the economy. Start a company. Give it to charity. Or they can be unproductive idiots. You or the government has no right to say otherwise.
Right and wrong don't work here, and I never said it was inherently wrong. This is a difference of opinion. You want the government to control more of our lives and tax us more - presumably to redistribute the wealth to people who will certainly run the risk of being unproductive idiots. I want less of both.
No one is saying what you can and can't do with your money in this regard. You have several choices with your earned income. You can buy guns (and pay sales tax), you can give it to your kids (and pay inheritance taxes after a certain amount), you can give it to charity and pay no taxes. Or you can gamble it all away in Las Vegas.
Fair enough that you want to have lower taxes. But the fact that estate taxes are a form of double taxiation is not an argument for lower taxes. The idea of double taxiation implies an issue of "right and wrong" and that it's wrong to have double taxiation, though it exists everywhere.
Personally I would prefer higher estate taxes and lower other taxes... and this is coming from someone whose kids will likely never have to work a day in their lives. Tax cuts for the middle class go a lot further for our economy and for preventing unproductive idiots than tax cuts to the wealthy.