Usually inheritance tax is only for people who are quite wealthy. Most places the average person passes down what they own without any significant tax. It’s only when you control well more wealth than you actually earned (the ultra wealthy did not get their wealth through their labor) where there’s any significant taxation. I don’t know why you’d be against this, except for the “temporarily displaced billionaire” mentality. It is a way to redistribute unearned wealth, and attempting to make who you’re born to not the determination for success, and that’s a good thing.