https://www.poynter.org/2016/whats-life-at-the-washington-po...
It is possible that a well run, honest, independent newspaper is still a viable business model, if guided smartly in the online environment; maybe Bezos really just believes that? If so, then robust editorial independence would be part of the business model.
To quote you from higher in the thread, "But it seems to be in their long term interest to have a fair, balanced political system and liberal society as we have now in the US." Is buying a news paper to promote that idea not a form of activism?
The WP has covered various union's arguments against Amazon, eg: https://www.washingtonpost.com/news/wonk/wp/2017/07/17/why-t...
I think you may misunderstand what left-wing people generally think. This quote from the above article summarizes it quite well:
Jon Leibowitz, a former Democratic chairman of the Federal Trade Commission, said the agency has a duty to challenge any deals that could end up hurting shoppers.
“Think about the Amazon business model — that’s typically bringing down prices and enhancing innovation, which is a benefit to consumers,” said Leibowitz, now a partner at the law firm Davis Polk. “But the FTC is a very professional agency, and they’re going to pay attention to any substantive concerns raised by outside parties.”