From the rules reference:
"For all selections, an option that has the potential to change the game state must be chosen, if able."
"If an ability instructs a player to select among multiple effects, an effect that has the potential to change the game state must be selected."
Now, we definitely know that dishonored characters cannot be dishonored again, so you cannot dishonor them as a part of For Shame!.
It would seem to be true that this is also the case when a non-honored personality is targetted during a conflict where a Steward of Law is present, since it is not possible to change the game state by dishonoring that target.
Triggered effects stipulate that other cards are not considered when determining potential "A triggered ability can only be initiated if its effect has the potential to change the game state on its own. This potential is assessed without taking into account the consequences of the cost payment or any other ability interactions."
No such stipulation is made regarding regular abilities/events etc.
A friend of mine was told however that you can choose to dishonor and it simply does nothing because steward of law op.
Thoughts? How can I get an official ruling on this?