If you tax the rich, even highly, they stay rich. Their lifestyle is still luxurious and they don’t go without food, shelter or warmth. The rich all have a certain sum of money in their banks which just sits there. Most of it come about by interest, is not earned and It will never be needed and it will most certainly never be used. Taking a fraction of this money, which again will never be missed, to use for the better of society has zero impact on the lives of the rich, yet it could mean life or death for someone else.
The ideology of “It doesn’t matter if I never use it, it’s mine” is fine if people aren’t dying from wealth hoarding, but they are. No-one is asking the rich to live in a council house or to have any less of the wonderful things their money brings, rather it is like 5 pence being taken out of my bank account per year to help someone who is destitute.
I see no issue here.