When I was younger (OK - a lot younger) I read several article that scientifically investigated the events and concluded that it really happened
personally I think the word "scientifically" is doing rather too much heavy lifting in these cases
but it did seem like several people who had a decent brain looked at in independently and said that the people did seem to have suddenly burst into flame for no apparent reason
one person said that the combustion seemed to be different to someone who had had their clothing catch fire or been covered with a flamable liquid because they seemed to have been burnt from the inside rather than skin inwards
which could be bollox of course
but there was a video of a performed in a night club suddenly catching fire which seemed convincing at the time
I mean - stage lights, 1970's costumes , drugs, drink
Nah - no other reason there mate must have been SC