I don't think you're seeing the whole picture if you think only about physical force.

People who are well off have more opportunities to start other ventures that make them even more well-off, and if they're especially powerful, they can use that influence to further their benefit. I don't think that's particularly controversial.

To wit, I live in a mid sized town in the Midwest - about 80 years ago a family started a business that was pretty successful and is on its third or fourth generation of ownership now — that’s all well and good but it’s insane how much of the town is owned or directed by them now. Do you want to buy a car, foreign or domestic? Host a convention? Rent a hotel room in the urban core? Put on a concert? How about go to the hospital or buy health insurance? Go to college? Send your kid to preschool? Build a commercial building?

Capital begets capital.

It’s not easy to start successful ventures. Most new ventures fail. Even the best VCs only have a 30% success rate.

That doesn't contradict anything. Most people can't afford to start a new venture, so they have a 0% success rate.