The right answer conflicts with people's cynical views about other people. The dissonance is incredible, and it's one of those areas where even the most analytically intelligent people are just as susceptible. To step back and see the bigger picture requires exercising many other skills and faculties, like empathy, self-awareness about our fears, and constant reflection on history--bad things do happen, more often than we realize and often right under our noses, but not in the way or for the reasons we tend to blithely assume. The things that go well and demonstrate our common humaneness and how well civilization works tend to be taken for granted or just go unseen and unrecognized. I share in the dissonance, but on my better days I like to think I'm a little better than average at remembering and reflecting on it.

Occasionally we see people motivated to do some of those things, though. And when they're not also complete idiots, they can cause big problems.

What would someone like the Tsarnaev brothers be able to do with the power of an unrestricted LLM? Well-financed cartels? Organized terrorist groups?

Yes, there used to be an uproar about stuff like the anarchists cookbook... and people did attempt some of the things it outlined. The saving grace is that many of the things in that book were just wrong anyway. They likely served as unhelpful misdirection as much or more than they were dangerous. Unfortunately, LLMs are a lot more accurate and helpful.