Troy, as you know I was critical of the ARod trade, not in a forum post but in a private email to you.
Absent other factors (like team need) that I can't imagine here, I don't think the Vidro trade should have been cancelled,
assuming you are talking about a trad league.
If the deal is in a Real Time League, Vidro has a hairline fracture in his shoulder that may take him out of action for some time (exact amount of time unknown as far as I could see).
So, if this were a preseason deal in the RT leagues, I might see a reason for putting a stop on it at least until Vidro's condition is know.
Otherwise, I don't think it's so unfair as to need to be stopped.
Dave N