Even if it's actually the Rothschilds we're talking about, that doesn't mean these guys are from one of the branches of the family where the money is. The Rothschilds got rich in the 18th century, so that's quite some time for wealth and influence to wane.
Think buying an apartment on credit vs renting it. The apartment bought on credit you'll eventually own, but not the rented one. So assuming you need an apartment, buying on credit can easily be the better decision.
An article which clearly shows that their influence and cohesion has waned since 18th century.