Because most people have the notion that the money Bezos makes is deserved. Society has been conditioned into believing that the value of their labor is set by the capital owner(s) and the owner is entitled to as much profits as they desire because they’re the owner. It’s a huge undertaking to question societal norms and reject the capitalist value of labor. It’s especially daunting when the opposing ideas have been presented as blasphemous and condensed under the umbrella term of “Socialism”, which itself has been demonized into an evil ideology that is fully incompatible with democracy and freedom.