I think you're moving the goalposts here. The original claim was that high-risk behavior isn't reliably inherited. You gave blood type as an example of an inheritable factor, but there are many other inheritable factors beyond blood type. The fact that we can identify not just inheritable factors but specific genes related to risky behavior clearly undermines your point.

Whether or not the risky behavior is due to single alleles or complex interactions between multiple genes is a different argument than whether risky behavior is inheritable.