Maybe I am way off base, not knowing enough about these companies individual cultures, but

What I see from Apple, FB, and Google is too much optimism and belief in good. They arent cynical enough. "We are doing this gray area thing in a good way, and what we are doing WONT be used for bad." Its either sheer willpower of the leadership to force this culture OR its cognitive dissonance, OR its a lie and manipulative means to an end. In some way, I do believe Mark delusionally believes his "bringing the world closer together" so much so that it causes him to not think critically enough about how many people benefit from conflict and divide.

Apple takes a cynical approach to privacy, but an optimistic approach to the value of walled gardens.

Facebook takes a cynical approach to security and uptime, but an optimistic approach to evil social use. They default to "most people are good, and the few bad ones can be silenced. We can do this through AI and some eyeballs." Facebook, like many other companies is also WAY TOO OPTIMISTIC about people reading popups. People forget acknowledging something by the next day. People want to play a quiz, they are conditioned to click next next ok until they get to the quiz. Facebook vastly overestimates the majority of the populations care in knowing: is this safe to click, what are the consequences of clicking, do I know what I am doing, do i know how this works, do i care. You can honestly tell me that 99% of the world population understands what installing an SSL cert on their device actually does?

I think defending Mark amounts to people BELIEVING that the work they do WILL BE used for more good than bad. And people who distrust Facebook's competence care more about how tools can be used for bad than good. And so if you believe that youre building something that COULD be used for bad in the wrong hands (or you believe a competitor could build a more evil version first if you dont,) but believe you are the right hands to execute it in a positive way, you obviously are going to defend the leadership that vocalizes and spreads that belief among the workforce.

Apple would do good to give up a little on vendor lockin. Their turning point was iTunes being available on Windows. Microsoft, Google, and Facebook have all come to terms with making their best products run on all platforms. Homekit could be a good start. If spouses are split Apple/Anrdoid, they should both be able to manage a smarthome equally. Apple should be releasing killer apps that function fully on other platforms, but have some added benefit when run on their more integrated os.

Facebook would do good to stop believing that speech is good by default, and focus on amplifying "good" speech, instead of spending monumental effort to downrank "bad" speech. Facebook needs to let go of its cognitive dissonance, where it believes sharing twerk or fall viral videos equates people sharing their personal social experiences with close friends. Facebook may need to give up on its belief that one platform can function all as reddit/youtube and craigslist/vacationbabyphotos.

(As for google, they are way too optimistic that their org structure will support building and launching a product, and then iterating it. No one with any semblance of historical context trusts them anymore after reader/allo etc.)