While I agree with the sentiment it's worth noting that this wealth isn't usually liquid. It's tied up in other assets. Like shares in companies. Liquidating those shares to pay a wealth tax will also dilute their influence in those companies. Not to mention liquidation comes with additional taxes.
I wonder how having assets seized would affect their tax return. It could be that it would be beneficial for them to put up a fight and get the assets seized instead of liquidating them and then being subject to a huge tax bill.
The asset's worth should be at least the value owed in taxes + 10% liquidation fee to nip shit like that in the bud. No more loopholes, no more leeway.