Every single time someone tries to make a tax targeting the ultra rich, someone writes a comment just like this. Every. Single. Time.
As far as I can tell, this comment is semantically identical to:
"Every time someone tries a new cancer therapy, it ends up not helping the worst cancers."
"The sting operation was a failure because it only caught low- and mid-level criminals."
"We shouldn't use automated tests because some bugs cannot be caught by it."
"Look, this bully is ten times stronger than my kid. He's gonna beat him up whether my kid wants him too or not. We should just accept that the kid is gonna get pummelled."
There are at least four flaws I can see:
1. The obvious "perfect is the enemy of the good" argument. Unless you have an alternative proposed tax that is flawless, then the comment does not get closer to a world where people pay a share of taxes commensurate with their point on the wealth continuum.
2. By framing it as "hurting" the moderately wealthy, it applies a narrative that taxes exist to punish, that the extremely wealthy deserve that morally, and that the moderately wealthy do not. Every piece of that narrative is wrong. Taxes exist to fund services, not enforce moral orders. It's not like we have a higher tax rate for convicted criminals. The moderately wealthy also have a capacity to afford taxes higher taxes without lowering their quality of life, so a tax law that hits them too has not "failed". Even if taxes were punishment, this comment presents no actual evidence that the moderately wealthy are morally purer than the ultra-wealthy.
3. Some fraction of today's moderately wealthy are tomorrow's obscenely wealthy, so applying some tax pressure on them today is a step towards preventing them from escaping that tax burden tomorrow.
4. Equating people who make 500k in a year with "the working class" is... I don't even know what to say about it.
5. Forcing the ultra-rich to do extra work to dodge this new law is a net good. Defeatism, which seems to be the counter-proposal here, makes it even easier for them to retain and acquire wealth. We should keep passing laws. Every time they find a loophole, close it. Vote out politicians that get bought. Make them keep jumping. Wear the fuckers out because eventually some will lose if you keep trying. If you let them win... well you let them win.