Yes. We buy our vehicles from manufacturers. Then we need to add several safety features or make changes to the vehicles to make them safer.
Our most commonly used vehicle right now has eight motors. So, as you mentioned, even if a motor fails, we could ultimately complete the mission and have a normal landing. Also, the batteries are connected in parallel, in case one of the two fails. In short, we do have several safety features.
We also have a number of safety procedures. For example, it is the pilot's responsibility to keep the aircraft in line of sight, avoid the plume of smoke as much as possible and fly with the back to the wind precisely to stay out of the smoke.
You were talking about onlookers. When there are operations as a result of a fire or anything else, it does attract a lot of attention. However, there are teams of policemen, firefighters and paramedics who establish security perimeters precisely to ensure that bystanders do not come too close to the fire scene.