Because they live in small nests, bumble bees never swarm - so you can encourage a nest or two in the garden without fear of this happening. Bumble bees do not produce enough honey for commercial use, just a few grams at a time to feed their young. Not all bumble bees have a sting. A bumble bees biggest enemy by far is a man armed with a pesticide spray. Like every other form of wildlife they are under serious threat from the chemicals we pour on the land.
Bumble bees are much less aggressive than honey bees.
Generally they will not attack a human at all, unless their life is under threat. Don't wave your arms wildly in their presence, stand quietly and once they smell you are not a flower with pollen they will move gently away. When the drones hatch in mid summer the sudden increase in bee numbers frightens people who are nervous about insects. But remember these drone bees have no sting and they won't swarm.