Hahaha, as someone that works in AI research, good luck to them. The first is a very hard problem that won't just be prompt engineering with your OpenAI account (why not just use 3D blueprints for weapons that already exist?) and the second is certifiably stupid. There are plenty of ways to make bombs already that don't involve training a model that's an expert in chemistry. A bunch of amateur 8chan half-brains probably couldn't follow a Medium article, let alone do ground breaking research.

But like you said, if they want to test the viability of those bombs, I say go for it! Make it in the garage!