If you own a paper money isn't the point. Just like in a hospital or a law firm or even a bank. You do the right thing because society trusts you and making money comes from that. Do the wrong thing, and your business will vanish.
The problem extends beyond WaPo, though. He is connected with other companies that rely on government contracts or are otherwise subject to current and/or future government regulation, e.g., Amazon, Blue Origin, etc. WaPo may be the one he's willing to risk in this instance?