Bob suggests killing any aggressive hives one comes upon and states that Dr. Guzman doesn't suggest this. Most of his work was done in Mexico where the bees are all aggressive. (not all, but most). 

The effect of africanization on honey production, defensive behavior and size of honeybees (Apis mellifera L.) in the mexican high plateau

This study was conducted to determine the effect of african genes on the production of honey, stinging
behavior and size of honeybees (Apis mellifera L.) from colonies commercially exploited in an africanized
area of the mexican high plateau. Data on honey production, stinging behavior and size of workers from
416 colonies having european or african mitochondrial DNA (mtDNA) were analyzed. Bees from colonies
with african mitotype were significantly less productive, more defensive and smaller than the bees from
colonies with european mitotypes.

Conclusion
The introgression of African genes into commercial
populations of honeybees in the Mexican high plateau
decreases their honey production and their body size,
and increases their defensive responses (stinging).

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