Investors aren't a class. "Investors" includes pension funds, university endowments, hedge funds, banks, sovereign wealth funds, individual savers - the only thing these people have in common is they have funds and want to grow them, but they differ completely on risk preference, time preference, amount to invest, etc, etc. I.e., they all pursue their own individual self-interest, not some collective class interest.

Some of these entities fund lobbyists and some don't.

mythology ... opaquely-funded think tanks

I don't know if you are a Marxist, but this is a Marxist way of looking at the world, where each class pursues its collective interest, and funds propaganda to spread a self-justifying mythology.