I wish we could keep them. Bees are just cool. But they also might decide to hive in the chimney one day and maybe someone would be allergic to their stings.
But I've been reading this Internet doo-hickey and bee keeping a single hive is not especially labor intensive. And imagine the honey and wax we'd have!
I don't think these are the Africanized ("killer") bees. They are rather docile, even when I tried to get them to leave on their own with some smoke. Did you know that Africanized bees may have aggressiveness as a gene? Makes you wonder about nature and nurture.