I find it hard to believe that the other owner did a good, detailed job trying to shop that SS, and this was the best deal he could find.
I think sometimes when you see a salary dump deal, if the owner didn't shop the player around hard enough, a lot of other owners who weren't even aware the player was available think to themselves, "I'd have given up more than that in a heartbeat" and slap the veto on.
On the other hand, if the owner did a good job of patiently shopping the guy around, making sure everyone knows he's available, it becomes easier to say to everyone else something to the effect of, "If this is such a one-sided deal, why didn't you want the player at a similar price?"
But just looking at the 2 players involved, I can't imagine he couldn't find someone who would give up considerably more for that player if he looked hard enough, and I suspect that's the underlying cause of the veto.