The person who has died isn’t though taxed. They have paid their taxes. It’s those who inherit who do. People who have made no direct contribution to creating the assets. There are generous allowances. Spouses inherit everything without any tax. Leave your house to your children or grandchildren and the £325000 threshold increases to £500,000. Leave anything above the threshold to a charity or amateur sports club, no tax. Don’t use all your threshold and it transfers to your spouse. Give your wealth away 7 years before you die, no tax.
So there are plenty of opportunities to ensure your wealth isn’t subject to tax. However, why should anyone who has not earned the wealth be able just to live on it? I firmly believe everyone should be responsible for themselves and the current arrangements are more than fair. They enable some help to be given, for good planning for that to be substantial, and even total. It’s not unreasonable that we all get a share, via taxation, if no special arrangements are made.