From the link you yourself gave, Larry:

On June 30th, 1908, something exploded 8 km high on the river Stony Tunguska, destroying about 2150 square kilometre of Siberian taigà. Still today, it is not clear whether it was a comet or an asteroid or something else. We are searching for an answer.

You have to admit, there are significant questions regarding the event, and alternative explanations, as long as they are realistic, have to be considered. I still haven't seen anything that comes close to being proof positive that Tunguska was caused by an astronomical body. Alternate explanations I've seen have had holes, too, but that doesn't mean there isn't some other explanation.