I want to put this out as a thought experiment. Given that current taxation policy is primarily derived from incomes, and an inheritance is by strict definition an income, then wouldn't it make sense for all incomes to be taxed equally?
I'd be more sympathetic to inheritance if the primary source of taxation was wealth.
The first was recognizing that that inheritance mostly came from the labors of someone and they have a right to do with their money as they see fit. The second is acknowledging that the person who didn't work for their wealth usually squanders it so don't waste time being jealous of them.
So focus on being the person who creates wealth for themselves and try to educate your children so they will have good money habits later on in life and will squander less of what you leave them.