Bill Gates shouldn't be listed as someone who inherited his wealth: he did not inherit it.
The $100 billion he'll give away was of his own creation, spurred from effort of his own mind, from a company born of his own fingers and imagination.
We're having this conversation thanks to the Internet, probably via relatively inexpensive tools/gadgets. Which means we've all inherited an extraordinary privilege - courtesy of the immense efforts of countless others and countless invested wealth - that I would argue is drastically beyond anything Gates had the benefit of despite his family. What have you done with it? (rhetorical)
The privilege we're all enjoying right now - all of this easily accessible, relatively cheap, amazing technology - is beyond anything being born to a successful Seattle lawyer is worth. Why aren't we all millionaires N times over? If you understand that point, then you understand why Gates deserves credit for his wealth.
His mother didn't make the deal with IBM (in fact Ballmer was arguably most instrumental in the nuanced legal structure that gave Microsoft its position), and his mother didn't execute and build software for 30 years against tremendous odds and competition either. Is your theory that Bill Gates should be penalized for being born into a family and situation that was not of his own choosing? Such that you pretend his wealth wasn't of his own creation and is null and void, because his father was a lawyer (remind me again what making $100k a year as a lawyer in 1970 has to do with your son generating a $100 billion fortune in 2000, seems to me there are a lot of extraordinary steps required to get from one to the other no matter how good your first step is, whether you're Steve Jobs or Bill Gates).
There are 9 million millionaires in the US currently, and this country has been rich for a long time now. Why aren't we drowning in Bill Gates clones? The answer is obvious.
Any idea how many successful lawyer sons didn't generate $100 billion in wealth the last 40 years? All of them but one. Gates is one in a million even by that narrow-down.
I'd counter argue that Buffett would have been successful regardless of his father being a Congressman (it's absurd to think that a one term trip to DC is what made Buffett what he is). Indeed, using Buffett as an example is the absolute worst thing you could do: the market doesn't care if your daddy was a Congressman, it was his massive results that spoke volumes, got people to invest with him over time, and made him rich. Some of his shareholders held for decades. It was his understanding of how to make money, and his ability to sell that vision, that scored his first investments. Even doctors don't like to lose $100k to some idiot kid, no matter who their father is (his father wasn't that important, and his grandfather's stores weren't that wildly successful).
Or did you think people were buying Berkshire at $100 because his daddy was a a borderline irrelevant Congressman for one term?