But there's more at play here. I briefly worked on Twitter's anti-abuse engineering. Many of the people on that team cared a lot about protecting people. I sure did. But we didn't have the necessary power to actually solve the problem.
The people who did have that power were senior execs. They might say that they cared. In their heart of hearts, perhaps they even did. But their behavior demonstrated that they cared about other things much more.
My boss's boss, for example, was an engineering leader who had a climber's resume: quickly advancing through positions of more and more power. In my view, he cared about that a great deal, and did not give a shit about the actual harm to users. As soon as he got the chance, he pushed out my boss, laid off the team's managers, me included, and scattered the people to the wind.
I presume the same was true about the senior execs. They were aware Twitter was causing harm to people. If they wanted to know the details, we had plenty of research and they could have ordered more. Did they care? Impossible to know. But what they focused on was growth and revenue. Abuse was a big deal internally only as long as it was a big deal in the press.