[solenoid0937]

Superintelligence itself is the mini nuke. With it, you can hack virtually any system, order some viral precursors and put together a bioweapon at home (yes you can actually do this, they are available for sale freely), etc.

[atemerev]

Not exactly. I used to run my home biolab for CRISPR experiments (thanks to TheOdin for hardware and materials). This is harder than you think. Cultivating viruses is hard. Bioweapons are not about synthesizing new viruses (though this alone is a hard problem - you need growth environments and a lot of lab hardware) - they are about weaponization, aerosol production, hardening tests. You'll need to spend a few millions just for the prototype stage. And if you are into bioweaponeering, you'd better source some actual bio experts, they are quite available.

Knowledge is widely available already. Regulations there are not about witholding the knowledge.