Comment: Conjecture, assumptions, some common sense

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In reply to comment: To the contrary. The evidence, (see in situ)

Conjecture, assumptions, some common sense

The entire building came down "at once", not suspicious?

What building comes straight down without interruption?

Lest I be reckoned as a fool, you do not want to know what happened, correct? Get this out in the open so the subject can move on, be so kind?

edit:

Under what circumstance(s) do buildings fall down?

How many circumstances are there for a building to fall down?

Do buildings fall straight down under any circumstance?