Every bad actor who wants to make dangerous substances can find that information in the scientific literature with little difficulty. An LLM, however, is probably not going to tell you that the mostly likely outcome of a wannabe chemist trying to cook up something or other from an LLM recipe is that they'll poison themselves.

This generally fits a notion I've heard expressed repeatedly: today's LLMs are most useful to people who already have some domain expertise, it just makes things faster and easier. Tomorrow's LLMs, that's another question, as you imply.