They just don't want people to have the new Asian snack.

In some Japanese mountain villages, the nests are excavated and the larvae are considered a delicacy when fried.[3] In the central Chūbu region, these wasps are sometimes eaten as snacks or an ingredient in drinks. The grubs are often preserved in jars, pan-fried or steamed with rice to make a savory dish called hebo-gohan. The adults are fried on skewers, stinger and all, until the body becomes crunchy. Wikipedia

They are big that's all. Paper wasps are just as nasty in a swarm.