People who bang on about increasing inheritance tax seem to ignore the reality that it hits ordinary people most, as the very rich always find a way to avoid it.
So where would this 95% of people's assets go to then?
To charity? Many people don't trust charities anymore, as they pay huge salaries to their CEOs, and there have been scandals in the past due to mismanagement of funds.
To the government? I don't want all my assets that I have worked hard to accumulate to go straight back to the government - I don't trust them to spend the money they already get, why would I want to give them more. They have shown countless times how wasteful and inefficient they are.
It's human nature to want to protect what you have, and pass it on to your children and people will find a way to do so. Most of us, if we ever get an inheritance, it's usually a one off and doesn't confer fabulous wealth, maybe just enough to pay off debts, clear a mortgage, have a nice holiday etc. basically make like a little bit more comfortable. It doesn't catapult us into the mega rich category.
To really tackle inequality you would need to go after the myriad of ways rich people evade tax, like trusts etc. But that won't happen because those in government want to keep them and their friends in wealth. Taxing corporation profits properly would also be a better way of raising revenue.