I mean of course people with money who realise not everyone who is poor is poor because they're lazy bums will be more inclined to help a "poor person" than they would if they believed all poor are lazy bums. But does that mean they will accept high taxation? Say I am rich and narcissistic, I believe I'm better than everyone and that my skill put me on top. I then realise that other who are skilled are poor and I want to help them become richer. Do I believe that paying the government to use my money for welfare to be the most effective use of my money to fulfil this end? Probably not in that case.
Furthermore some people are lucky, some unlucky. This does not mean that no effort but mere luck goes into building an empire. If luck was the only factor then sure, this argument or taxation might hold. But there's a lot more than luck to it, which is much more in the control of the individual.