1) Remember that CEOs of public companies are essentially unable to say what they think or want. The cost of doing it is being sued for damages, having to spend countless hours with lawyers, etc. Jack might think X, but he's only allowed to say Y, and he doesn't want to go beyond that because he doesn't want to fight that fight.
Only people in a close circle really know what's going on, and it's most certainly not random people on the Internet (or HN).
2) Also, consider that Twitter, and perhaps Facebook (sorry but I don't give a sh*t that its new name is Meta), are really difficult companies to run, especially if you'd like to do some public good, as opposed to just maximizing returns.
There are so many things that can go wrong, so many other things that will set your company on fire without warnings, and that doesn't give people the time to think strategically on how to tackle certain difficult scenarios.
Twitter and Facebook essentially control most of the public discourse these days; never seen such amount of power in the hands of a few companies.
3) Despite common opinion, I actually think that Twitter (unlike Facebook) has done more good than harm. Why? Because it has essentially enabled an incredible explosion of "voices" that can be heard (err, read) all over the world.
4) Yes, we can think of countless ways to make Twitter better, but remember that Twitter is not run by Jack Dorsey, nor that other companies are run by their CEOs. Companies are run by boards, which means, by large funds with controlling interest in these companies. Even a well-intentioned CEO has to fight against many things his/her board want. And unlike enlightened CEOs, enlightened boards are essentially a very rare creature, almost never seen on planet Earth (IMHO).
5) You might think I'm defending Jack, perhaps I am, but it might be because hatred is really easy to dispense, while trying to be balanced in your judgement is really hard, and perhaps the conversation about Twitter should benefit from cooler heads, as opposed to quick slogans.