In 1995, Aum Shinrikyo carried out attacks on Japanese subways using Sarin gas, which they had produced. They killed over a dozen people, and temporarily blinded around a thousand.
You seem to be claiming that the only reason we haven't seen similar attacks from the thousands of worldwide doomsday cults and terrorist groups over the last three decades is that they don't want to. I disagree. I think that if step-by-step, adaptable directions for creating CBRN weapons were widely accessible, we would see many more such attacks, and many more deaths.
Current SOTA models do not seem to have this capability. However, it is entirely plausible that future models will exceed the capabilities of a bunch of long-haired cultists, in the mountains, in 1995. This is not a fake risk.