It is nothing weird about this really. Higher taxed countries are able to offer better public education and health care which gives the lesser of actually stand a chance of making it.
In the US the system is especially rigged. There is no free school choice, so you are forced to go to the public school in your shitty neighborhood if you are poor, while the rich through never ending donations enjoy schools with abundant resources. And even if the schools were good you would be screwed before you even get in, because the US does not offer quality child care to poor people. Research shows the years before school is the most important for future development.
I live in a poorer area of Oslo, but I could if I wanted to send my kids to the schools in the richest part of town without any extra cost to me. But it isn't really important as school quality is pretty even, through proper public funding rather than relying on private donations. Also we get subsidized child care of a quality that typically only upper middle class buy in the US.
If you don't even the playing field in a persons early years you are not going to see much social mobility.
http://www.usgovernmentspending.com/us_20th_century_chart.ht...
Note the ever larger share of government spending as a percentage of the GDP. This doesn't happen unless taxes, in one way or another, go up.
So you want successful entrepreneurs to be poor? It's only seen as a holy grail because it allows for tremendous fiscal success.
But I'd want to see a world where headlines like "Entrepreneurs are just rich kids" cease to be, because that headline is only created when entrepreneurship is put on a pedestal and is seen as something that is inherently superior to everything else.
People wouldn't feel indignant that it is "unfair that rich kids have an advantage" at the entrepreneurship game (which they absolutely do), if entrepreneurship weren't seen as this holy grail mount Kilimanjaro thing.