As long as Facebook picks and chooses what content it displays on my feed, it is not at all inconsistent for it to pick and choose what content it will not display on my feed.

Facebook isn't a dumb pipe. If it feels like it can fiddle with my feed to maximize its profit, its perfectly reasonable for its employees to demand that it does so in an ethical way.

Your argument would work if it were a dumb pipe (Like my phone line is.)