i understand, you think that increased taxes by 3% on people who make over 250k per year is going to damage the economy in a significant way.
What you are not seeing is it is mostly not single individuals but small businesses in these brackets. There are a very large amount of small businesses that still file at the individual level where that 3% means a hell of a lot. This is how it is crippling and a big deal.
Noone is arguing that a single person with that amount shouldn't care much but when that now also represents a business as well, everything changes. 3% + or - could make or break a business.