Even without the whistleblowers, there were a bunch of studies of how damaging Instagram is for the teenage girls. He knows this, everybody knows this, and, he's not locked up for selling dope in a twisted modern way! Knowing that he is damaging the society and most vulnerable parts of it - the young people, and continuing to profit from this makes is much more than just a benign quiet sociopath. Not to mention all the hatred he helps organize and selectively censors the type of hatred misaligned with his own. It's about time to break down Facebook into pieces - the way regulators broke down at&t before!
Essentially, twice as many teenage girls said IG made them feel better as said it made them feel worse.
That doesn't suggest that IG is a large problem for teenage girls (note that this was also a very small sample, because it was qualititative research).
Like FB have done a bunch of things I don't agree with over the years, but reading the actual documents that the WSJ used for their files is revealing in terms of what they did and didn't include.