On the other hand, we need the money and not many places give you money for operating expenses. However, you raise serious questions that are not easy to answer, which is why this debate is perennial. I would like to divide your questions into two parts and look at them both. The first part is the idea that there is dirty money and clean money. I don't subscribe to this idea.
Money is a tool.
Similarly a hammer is a tool. A hammer can be used to help build a house or it can be used to bludgeon someone to death, but we never talk about dirty and clean hammers. Because we don't credit hammers with power they don't have, we are able to see just what a hammer is and to separate the hammer itself from what it might be used to do. We need to get that kind of perspective on money. Money can be used wisely or squandered.