When is a serial-killer not a serial-killer? When they have lot of money or a big foundation? Don't think that's the case at all. Even if this 'vaccine' was well-intentioned, you still cant kill or maim people with deadly diseases even if those exposures to infectious agents was purely by accident. Manslaughter at the very least. Millions of cases of such?

Incidentally, the clips of him talking about using vaccines to 'help' the world by wiping out huge parts of the population is all the statement around intent that you (or any court) would ever need. A malicious actor.