It's not so much that the key people at the top of Facebook "see no evil," but that they truly, sincerely, earnestly believe there is no evil to be seen, or if there is any evil, they truly, sincerely, earnestly believe they can subdue it with great engineering and great management. They fail to see what every outsider, and many insiders, clearly see. Paraphrasing Upton Sinclair: It is difficult to get people to see…
I think it's more that city folk truly, sincerely, earnestly believe country folk are evil, and the fact that Facebook is not programmatically and automatically squashing country folk speech just because city folk want them to annoys city folk.
Then again, I do truly, sincerely, earnestly believe the enablers like Fox News, the GOP, et cetera are evil. The people who listen to them aren't evil, just deceived.