It's not so much the money, the wealth in itself, that bothers me about them, it's the mind boggling absolutely insane amount of power having that much wealth is capable of.

They literally buy elections, they buy media outlets, by their actions they buy the direction entire countries take. They use their money to fund the actions of others that work on their behalf. They can create a literal army of individuals to work for them towards whatever end they wish to achieve. That's entirely way too much power for an individual or a family to have. Just imagine living next to someone who has a 500,000 strong army of militants just hanging out. Maybe theyre good, maybe they want to turn your neighborhood into a warzone for kicks, either way you would have no means to stop them.

Just look at smoething like the "tea party" movement in the US. Grassroots? No, try Koch brothers funded with the intent to install Koch approved representatives into the government.