John may well correct me, but my understanding is that the Africanized bees are radically different.
Any honeybees will attack if an animal exhales violently into their hive. It is true that 'African' bees are the least unaggressive, requiring less stimulus before attacking, and persisting longer in an attack.
I generally intervene if a small child seems about to stick his finger into a beehive, or to breathe so close to the entrance as to risk an attack, though as I said before it is remarkable to see how lacking they are in any 'instinct' that honeybees are dangerous.
I am much more willing to let a child 'play' with a swarm of honeybees. This is also a remarkable sight, with a tight cluster of 10,000 to 50,000 bees hanging from a twig of a tree. While swarming, honeybees have nothing to defend (rather like people on vacation) so it is almost impossible to persuade them to sting. While standing on a ladder, I once cut a lower twig off so I could reach the bees on a higher twig (to collect the 'freebees' and put them in a hive of mine) but had not realized the two branches 'crossed' further in. The lower branch sprung up when relieved of the weight, and struck the upper branch, shaking about 10,000 bees off the upper twig onto my upturned face. (I was not wearing any protective gear.)
This was early morning, so the bees were too cold to fly. I could feel them walking around on my face, into my nostrils, etc., and could hear the woman who had called the police and then me to collect the bees screaming in the background. I was more afraid of her than the bees, and she later told me she had run for the garden hose before realizing I was OK.
After maybe 15 minutes, the bees in contact with my skin had warmed up enough to fly back to the cluster, so I could open my eyes, move around, breathe normally, etc. but there were several thousand bees on my clothing where they would not warm up in any reasonable time. I asked the woman to bring a hairdryer on an extension cord to warm these bees up enough to fly - I didn't want to waste them.
Not one of the 10,000 bees stung me. I have often let small children, including my son, push a hand into a swarm (after asking them to be gentle, because bees are very small and fragile). They are fascinated to feel the cluster give way, and then see the bees clinging to their hand when they withdraw. I tell them to keep fairly still while the warmth of their hand lets the bees fly back to the cluster.
Only once has a parent admonished me for endangering her daughter.