Tax isn't punishment. Ever. Especially when tax rate is already so low that the proposed "emergency tax" is still less than historical income tax rates.
Tax is part of the social contract that allowed those billionaires the stability, educated workforce, infrastructure, safety from theft, etc, etc, etc, needed to build and maintain their wealth.
The idea that billionaires "invest [their wealth] efficiently and distribute it" is laughably sophomoric, a parody of the Gilded Age's self-serving justification for robber barons. Billionaires invest efficiently _for the preservation of their wealth across generations of their family_, only the most credulously optimistic model of capitalism supposes that this aligns with "distribution" (whatever that means - trickling down, eh?) or with the best investments for society at large.