You might think "wisdom" is quite subjective, but remember that we have to take each argument on its own terms. Yes, we should notice where there are missing logical steps (assumptions), but sometimes we have to be prepared for premises or conclusions we wouldn't necessarily be comfortable with in the real world but that are valid on the LSAT (for example, if you see a premise that says "Linda is a better basketball player than Katie." - absent some extreme examples this is probably a subjective statement too, but on the LSAT we treat it like a fact).
So I think here the author saying that objective/good citizens will applaud this action is a good enough basis to say the author is thinking of this as indicating the wisdom of a certain decision.
As far as (D), I think it says the opposite of what you are saying. (D) says the argument overlooks the possibility that the president's own party opposed his measure. If (D) said the opposite of that - that the president's own party was pressuring him or at least strongly supportive of the measure - there would then be a basis to undermine this argument by saying that this was a partisan rather than a wise or courageous act, but we don't have that here.
I hope this helps. Let me know what you think