How could one define how much each was a determinant factor? How would sources such as Doyle, Hunt, DeTocqueville be able to evaluate the role of each?

One might argue that immediate concerns about maintaining domestic control that drove the revolution to terror; others argue that it was the logical consequence of a rhetoric that emphasized “reason” (however defined) and civic purity. How could one define how much each was a determinant factor? How would sources such as Doyle, Hunt, DeTocqueville be able to evaluate the role of each?