Every year in spring I used to get phone calls from a junkyard and a military base. The call always went about the same way – “Hi, there are bees in a car/jeep/truck/ambulance parked in our lot”.
It is not really. It is just a problem if a swarm decides to occupy a space you, or your pets/livestock/friends etc live in. Swarming is part of the natural cycle of renewal in a hive.