Class Warfare?

One proposal on the table to help pay for the new health plan is an additional tax on those who make a lot, be it $350k or $1m as the standard.

There is a counter argument that I really don't understand. Some are arguing that we can't implement any new tax on wealthier Americans because this is class warfare.

Let's put aside the point that these wealthier Americans have more and can give more. Let's put aside that they should probably want to contribute to the improvement of their country and their fellow citizens. Let's even put aside the argument that most of this country's economic and legal structures has been put in place to keep what they have in their hands.

Why is this class warfare? If anything, I would think knowing that wealthier Americans would put in a bigger share would foster better relations between the haves and have-nots. It would actually reduce the argument for a true class revolution.

I'm just saying. I think it's a pretty dumb argument.