I am probably one of the very few people on this planet who have actually brought down an aircraft with a drone (RC model).
I was flying a scale RC aircraft on the runway of an airfield after hours (with permission of the airfield authority). At the same time a hot air balloon took of at the other end of the runway, more than 1800 m away. The wind was blowing in the runway axis and I was doing circuits. My maximum altitude was probably less than 100ft in downwind. RC scale aircraft are difficult to fly and you cannot let one out of your sight for more than a second or two.
I saw the hot air balloon (about 100ft diameter) coming in low over the runway and tried to make my downwind even lower. I thought I was going to pass well clear of the balloon, but because of optical illusion (100ft balloon against 5ft wingspan of my RC model) I managed to hit it right in the middle of the envelope. There was a tear in the envelope, my model came down in a spin and the balloon descended slowly and managed an emergency landing remaining clear of the surrounding buildings.
Obviously the balloon pilot and his passenger came to meet me and ask questions. It was clear that there were no bad intentions whatsoever and the passenger was an old instructor of mine. My insurance paid for the repair of the balloon, several thousands. Obviously this could have been much worse if the envelope would have opened further.
This happened over thirty years ago, in over fifty years of flying, I have never put even a scratch on any of the aircraft or passengers. I cannot begin to imagine what damage a drone would to if it hit my windscreen at 180 kts.