I've heard people say that keeping the tankers away when a drone is in the same airspace is an overreaction, but those people are not thinking it through.
There are several factors that make fire-fighting flights very difficult for the pilots.
1. They are flying very low.
2. The air over and around large fires is often very turbulent.
3. The plane is heavily loaded, making it less nimble than normal, and making maneuvers put much more stress on the plane than they would on a less loaded plane.
The pilots are in a dangerous, stressful situation that requires their upmost concentration. Anything that distracts them is dangerous.
https://www.idahostatejournal.com/members/a-crashed-drone-co...
This one really pissed me off...
People have been killed by RC aircraft. I don't know if any accidents with quadcopters have caused injury (I'd assume having one fall on you from height wouldn't be fun), but there was a story a few years ago where a bloke killed himself with an RC helicopter.
https://nypost.com/2013/09/05/man-decapitated-by-remote-cont...
[0]: https://www.seattletimes.com/seattle-news/crime/man-charged-... (Open in incognito if you run into the paywall) [1]: https://www.sfchronicle.com/bayarea/article/drone-crashes-ou...