The short answer yes. If a drone was flying over the road at your windshield, as you are doing 65mph, you'll probably have problems driving, and even lower it could still do damage to your car if was at the grill level. Now double or even triple that speed, and your probably going to have even more serious damage. Remember double the speed, quadruple the force. As for around airports, they actually hire people to scare off and keep the birds away from the airport to protect the air space from bird strikes, and often civil airplanes are used at a high altitude limiting the time of risk to take offs and landings.
As for forest fire fighting, they are incredibly difficult for a pilot to work, with limited visibility, thermal up drafts and down drafts, high speeds, and drastic in-flight weight changes. These all create a massively complex flying environment, and in many cases considered as dangerous as flying a military fighter in combat. Now this is where drones become the problem unlike birds they might stay in an area where the birds would normally leave, secondly for water bombers they fly relatively low, often well within the limits of legal and physical capabilities of the drones.