Follow the money
The Center for American Progress owns the web site Think Progress, which has been the main source of attacks on Koch Industries. So, if you are looking for financial self-interest, let’s connect the dots: Thomas Steyer is desperately trying to influence the federal government to impose irrational costs on industries that produce energy from fossil fuels, so that his own hedge fund investments in inefficient (“green”) energy will be worth more money. The insane attacks that Think Progress, controlled by Steyer and his friends, have launched against Koch Industries are part of this business strategy.
Steyer knows which politicians will enrich him by imposing needless costs on fossil fuel-derived energy, and he contributes hundreds of thousands of dollars to them. This is on top of the undisclosed amounts that he contributes to his mouthpieces at Think Progress and other left-wing activists.