Bernie Sanders has stated he wants to tax billionaires into non-billionaire status. So yes, it's about eliminating the 1%.
You're also making some weird assumptions that transferring money away from billionaires would just destroy that money, and that the current billionaires are using their resources in the most productive way possible. The real world isn't Atlas Shrugged.
Look up income velocity of money.
There's nothing weird about that. You don't get to be a billionaire by being bad at managing your money, nor do you get to be a billionaire by investing in less productive investments.
By taxing the 1%, you are removing money from the most productive investments.
Since close to half of America's billionaires inherited their fortunes, that's not really something you can prove. And that fact that it makes money doesn't necessarily mean it's beneficial to society, nor does it even mean it's the most economically productive possible use of resources.
>By taxing the 1%, you are removing money from the most productive investments.
Billionaires aren't the 1%. And "the most productive" investments isn't something you can prove or even make a semi-convincing argument for.
2. Even if we do assume that the current billionaires are better at making money individually, there are still advantages to collective action. That is to say that taking 10% from the most individually productive members of society and building an interstate system likely produces more societal and economic benefit than whatever they would have done with the that money individually.