I think Girard passes muster in that the theory is often useful, in conjunction with others - that is, it passes the "Condorcet barrier of utility" and one can use it as part of a toolbox to explicate certain human behaviors.

Taking it as a unified theory doesn't work, just as any -ism taken alone to explain the whole damn thing doesn't work and is often counterproductive. For example - and I would be grateful if someone with knowledge of Girard would explain it - how does one bridge the Underwear Gnomes reasoning of say #12 in the blog:

Step 1 - We point out how we all act out of mimicry

Step 2 - ???

Step 3 - We "escape the endless cycles of reciprocal violence by rising above our desire for vengeance and working instead to delegitimize the urge to punish and scapegoat."