For example I might decide I really don't like the Jews (hypothetical). I could probably find out what DNA is common to most Jews, design a virus to target this commonality and couple it with something nasty that already exists, or that I just invented and release it into the population perhaps by infecting my gentile self and booking a flight to Jerusalem.
Your tone suggests that you're a bit bored by this conversation. Are you yourself satisfied that the risk of disaster is acceptably low?
Sorry, my perspective is very unusual. First, whether or not a nation-state bans biology (perhaps because of some precautionary stance) will not dramatically change whether or not I continue to work on technology development. Second, I already find the current level of death and disease unacceptable, and risk calculations don't help me fix things. I'm just completely uninterested in risk calculations.
Edit: I was being somewhat unfair to your original post, which I had judged to be more alarmist than it actually was. I agree that mitigation strategies are important.