Oh boy:
Here is a list of types of evidence or supportivefacts/variables etc...
1. Physical evidence (Columns, Det Cords, Thermite, DNA, Plane parts, videos, photographs, etc..)
2. Simulations (tower collapse, plane impact, etc...)
3. Witness testimony (via print or recording or both)
4. Expert opinion (Recognized experts in a field provide a paper with scientific calculations, hopefully validated as correct, in support of a particular theses)
I could go on I suppose, but no one is saying that computer simulation or modeling is BETTER than Physical evidence (although the modeling is often based on video and photographic evidence, sometimes more), but rather in the absence of physical evidence, it is a realistic, often used substitute.
TAM