Yes, if they think the government is going to be irresponsible with it, and their weaponized smallpox is liable to cause a global pandemic that will also kill many of their countrymen, it seems entirely reasonable for the company not to sell it, or be forced to sell it either.

In the abstract though, we're just playing the "what if" game. If a company had the nuclear bomb near the end of World war II instead of the government holding it via the Manhattan Project is a different scenario than we're facing today, and if the government in question is the USA, Ukraine, the Nazis, or Russia also makes a difference. The weapon is also hard to abstract away. AI isn't a nuclear bomb, nor is it a weaponized virus/bacteria or a chemical weapon like anthrax or sarin, nor is it simply propaganda leaflefts distributed by airdrop.