> What I did not see during my tenure there is any malicious intent, people genuinely wanted to build a valuable product and make broken stuff better.

But the argument is not that the many individual well intentioned engineers at Facebook (or even Zuckerberg himself) set out maliciously to create a monster; but rather that the confluence of new technology, human nature, incentives, advertisement, tracking etc. has resulted in something that has many negative consequences (which might exceed the positives); and of which they profit very handsomely.