As the vast majority of us who use flashlight use single cell lights, I'll ask; where has it ever happened in a single cell light? I have yet to see any reports of a single cell light exploding. The thread you linked to is about a three cell light using poor quality batteries exploding after the cells were charged on a charger that is known to over charge cells. Leaving Li-ion batteries on the charger overnight is never a good idea.

That being said I always use quality cells such as AW or Redilast.