I have a field of cicada killers so I am wondering if murder hornets may have a natural enemy here. The cicada killers do protect their territory with displays but I haven't seen them swarm with cooperation.
They will not sting a person! They live in bourrows like tiny volcanos.

Nicotenic systemic insecticide put an end to our prize winning beekeeping honey production. Europe put an end to bee killing insectcide but the US allows it for another decade.