Thanks for the link to that video. I don't have the time to watch it now, but I will come back to it later. Although on the surface, specifically targeted bio-engineered weapons seems like a silly fear for most us when bullets are so cheap. If someone wants me dead, I don't think any difficulty accessing my genome is going to be what stops them.
The choice of murder weapon obviously has more to it than whether bullets are available. The US has the most guns amongst its citizenry than any other on the planet yet a large percentage of homicides there are stabbings.
Availability, ease of use, likelihood of success/failure, and ability to be detected prior to and hence defended from, and for it to be detected after the act (who wants to be caught?) would all be considerations that may make it far more viable and attractive as a method, let alone the cost - bullets may be cheap but guns aren't.
