It feels to me like “Koch Brothers” is some kind of socialist dog whistle to rile people up. It’s like mentioning Rush Limbaugh: people get riled up over just the name, but it’s highly likely most people have never heard his show — just cherry picked, out of context quotes that are like red-meat to the starving tigers of left wing interest groups.
To be fair, the right has their dog whistles too. Mention Nancy Pelosi or George Soros and the right loses their mind as well. Acting like think tanks are some sort of capitalist conspiracy is just ridiculous.