There are historical patterns that indicate that when wealth (using the term colloquially) inequality gets too large then bad things tend to happen. Revolutions, for instance.
There is no specific damage done specifically by Larry and Sergey having become rich. There is damage if too many super rich people aren't contributing enough money to pay for national defense, roads, sewers, clean water, education, etc. They benefit from living in a society with decent levels of each of these things.
Since the middle class and the poor don't have much more money left to contribute to pay for these things then an argument can be made that the super rich ought to be taxed more. Part of the existence of income inequality comes from tax inequality. In the U.S. this is coming from the fact that much of the money the super rich make comes from capital gains and not earned income. The capital gains tax is quite low.
There is also the fact that money does bring with it power. If it gets concentrated too much into too few hands then that's a problem for a lot of people.
Let's get real for a moment here. Most of the taxes collected from you, me, Larry and Sergey go to wars and to social programs that are not actuarially sound (and thus are likely to disappoint those depending on them).
If it were just about sewers, roads, education, etc., then the top tax rate could be 10% and the middle class could pay no taxes at all.
The class warfare argument is a substitute (relied upon by politicians) for the real issue which is the imprudence and utter lack of responsibility of those allocating the money collected via taxes.
Note that Obama, for all his class warfare schtick on the campaign trail, has spent billions more on the wars he promised to end. His promise to fix social security by turning it into a welfare program (so at least we know what we're not getting) has also vanished.
I didn't talk about politics. I did mention national defense. My point about bringing up national defense, sewers, etc. is that these are things that benefit the super rich.
The fact remains, though, that too much wealth inequality is bad. It's bad for power to be concentrated too much into too few hands.
By the way, Social Security does not need to be fixed. Medicare and Medicaid do though.
There is no specific damage done specifically by Larry and Sergey having become rich. There is damage if too many super rich people aren't contributing enough money to pay for national defense, roads, sewers, clean water, education, etc. They benefit from living in a society with decent levels of each of these things.
Since the middle class and the poor don't have much more money left to contribute to pay for these things then an argument can be made that the super rich ought to be taxed more. Part of the existence of income inequality comes from tax inequality. In the U.S. this is coming from the fact that much of the money the super rich make comes from capital gains and not earned income. The capital gains tax is quite low.
There is also the fact that money does bring with it power. If it gets concentrated too much into too few hands then that's a problem for a lot of people.