My comments/questions would be...
Are the bees posing a problem for man or beast? Are they up high in the tree or down low?...with many entrances I would think they're up high. Does anyone have a garden or fruit trees close to the colony?...they will definitely benefit from the colony's pollination. If this is a new colony of bees it most likely means that it was a swarm that was a product of another colony that is relatively close...personally (understand that I'm a beekeeper) I would be tickled to have a bee tree in my yard.
It goes without saying that honey bees are good to have around.<duh> Feral European honey bees are really nice (if they're truly feral and just not a fresh swarm from somebody's hive) being as they are "survivors" and are dealing (without man's intervention) with the pests and disease that are attacking bees everywhere...their donation to the gene pool would definitely be positive. But, they *can* be in the wrong place and *can* pose a threat to people. I would *really* consider leaving these bees alone, but you have to be the judge of that.
Btw, if later on you happen to walk out and the air is filled with bees and you hear a very loud bee buzz going on, just wait 5-10 minutes and the drama should be over with. That will simply be a swarm being issued from the colony...swarming bees (relatively speaking) are very gentle though will still sting if stepped on, tangled in your hair, caught in your shirt collar, etc.,. The swarming bees will eventually land on a limb or lamppost, or collard plant, or something...and begin to form a large clump of bees that will hang there for a while. Beekeepers are happy to come remove these for people. As for removing the bees live from the tree...a "trap out" is possible, but rather involved and does take a while...but the bees would live.
It's your call on the bees. If they're euthanized someone will lose something very beneficial to their environment and ecosystem...but, if they're in a place that is a hazard for people and pets then it's your or your friend's call on what to do with them. As a note, killing the bees inside of the tree will leave a rotting mound of bees, possibly gallons of fermenting honey along with all the nice bugs that will move in behind the bees. Think of it like this...if there are 5 pounds of bees (easily could be that or multiples of that) and you kill them in the tree that would be equivalent to a 5+ pound dead dog hanging inside the tree

inch:...just sayin'....
Best wishes,
Ed