"the major threat isn't fixed winged AC but rotorcraft" I disagree. The major threat to aviation today are irresponsible UAV operators w/o any aeronautical knowledge who endanger everything on the air. .
I fully agree. I'm a commercial helo and fixed wing pilot as well as a hobbyist Inspire operator. Education is the key to operating safely in all airspace environments whether manned or unmanned and regardless of altitude.
Unbeknownst to the uneducated, there are many instances where fixed wing and helicopter traffic operate LEGALLY below 500' AGL. These include Alert Areas, Military Operations Areas (MOAs) and Low Level Military Training Routes (VR/IR Routes). Some have operating altitudes down to 100' AGL.
Examples of this in areas that I fly are:
Alert Area A-531 (about 300 sq. miles) in North Carolina vicinity of Troy where a friend lives. "Extensive Military Helicopter Training 200' AGL to 1500' AGL. Right there on the Charlotte VFR Sectional that is easily accessible VFRMAP - Digital Aeronautical Charts
Beaufort 3 MOA in South Carolina starts at 100' AGL.
Coastal 5 MOA in Georgia starts at 300' AGL
VR 1003 in Georgia starts at 200'
I do call the appropriate Flight Service Station (FSS) and ask if the areas/routes are active for where I plan to fly. I also check this website:
Special Use Airspace & Air Traffic Control Assigned Airspace
Also have to watch out for Coast Guard helos below 500' as well as the county mosquito sprayer in the MD-500 at treetop level.
If you are educated about airspace, educate others. If you're not, please learn and then educate others.