Billionaires buy politicians to write rules for themselves, to dodge taxes, exploit workers, fuel division, pollute our environment and destroy public services – all while raking in obscene profits.
Money is potential human energy. They accumulate so much capacity to inspire labor and then unleash it on us with a purchased army.
A billionaire next door is just as dangerous as a standing army next door. Maybe the neighbor is nice and won't use it on you, but they absolutely have the capacity to if they wanted. Too much wealth concentrated under one owner is a danger to society.