Impact deniers. They will be dealt with, comrade, they will be dealt with. ;-)
Darn right. They’ll be kicked in the asteroid!
I also favor the major impact theory, but also consider that this may have stirred up major volcanic effusion of the Siberian Trappes with lots of air polution. Also, it may by that the existence of a major supercontinent may have led to reduced ocean circulation. Certainly a major impact could have stirred up all these dead bacterial toxins, and perhaps also released ocean methane in large quantities. It is still a big puzzle.
I am currently reading “The Great Dying”, by Kenneth Hsu, 1986, about the great dinosaur extinction event. It took more than 30 years from the first suggestion of an impact even for scientists to begin a serious search for an impact site. Being much earlier the search for a Permian impactor will be that much harder.