Fighting wealth equality should happen in policies, not publicly shaming those who work hard and actually contributes to the society.
It is hard to explain to foreigners often, but there is a deep rooted culture of envy that historically have been strong where someone standing out in a positive way is pulled down as hard as possible.
I live in Finland and we also have publis tax information. I think the rationale for having that information public is to make hiding income harder... if you have no taxable income and your neighbour sees you buying new cars every year, that may cause him to go and talk to someone at the tax office. I'm not sure if there actually is someone you can report a suspected tax evader, but that's the general idea. The shaming is bad, but that is mostly done by the press here and AFAICT there is no shame if you have some reason for the large income. E.g. people owning companies are treated more like heroes.
But, anyway, what I really wanted to say was that the "culture of envy" is a myth. We have the same myth here too. The envy is mostly inside the head of people earning a lot of money. The people earning less generally do not care.
Personally I am very much in favor of public tax information. I usually check the income of some of my coworkers every couple of years. Usually their wages are very much what I expect, but once I noticed that my previous employer valued writing design documents over creating working software - and after learning that I decided to change to another job. I did not start raving and frothing at mouth.
Usually, what you imagine without the information is much worse then the reality.
Compared to what Google and NSA are doing, I find the public tax information to not be a problem.