Seems specious. Democratically elected representatives said it was to encourage the investment of capital as they wrote the laws, and then got reelected by the voters. You can say the representatives were lying and the voters didn't care / are dumb - but where's the evidence?

I think the simplest explanation for why representatives vote the way they do is the public statements they themselves make before and after their votes. If you want to make a more convoluted argument and assert a conspiracy, you should bring some evidence.