That is a slippery slop type argument.
Only to a degree. The bad form of slippery slope is when you say that you will certainly slide down the slope, without giving rationale for how or why.
I am merely saying I am not comfortable with the precedent.
And besides, it is already done with estate taxes.
Estate taxes aren't a flat commandeering of assets - they are a tax, and the estate gets to choose what gets liquidated to pay them, which keeps it from being an imposition on property rights. And they don't generally apply to assets transferred to your spouse, and the Federal version doesn't apply if your estate is under $5+ million dollars.