I'd say rather the matter concerning the Wise is lacking porportion. Yes, it was possibly a mistake to not send support to Gondor once Minas Ithil had fallen - but it's as best a moral fault, because the Wise have no duty, no obligation, to act in any matter what so ever. We impose expectation on them which we should be careful to demand.
To be a Wise is a matter of an honourary title based on the persons knowledge and not a official office with an assignment list, and the White Council is nothing but the Wise's personal chat group.
Further we shall take into account that during the wars against Angmar Imladris and Lórien help out to push back Angmar but not to take it out, and first when Gondor arrives with what to it is a small force they together with Lindon and Imladris can crush Angmar. This is not the time of the Last Alliance, the Eldar forces are not that strong.
Gondor in that end of the war fight next to the Elves, yet they once Minas Ithil is taken do not ask the Elves for help or support. The greater fault here is to a great degree theirs, as they should had requested aid - but we should not forget it should not, and supposedly they percived it should not, been needed. Gondor had yet many Dúnedain, of caliber shown in earlier discussed Boromir I, and weapons who could hurt Nazgűl (if we don't assume all weapons of the kind the Hobbits get from the mounds was lost in Gondor - but considering Boromir was feared by them least he probably carried one).
Over time Gondor grew weaker, but so do the High Elves as many leave Middle-earth; that all don't leave but some remain to act in any manner at all is a greatful boon, not something to be demanded from them. It remain something that is moral and righteous to do, but as often seen they are weary of Middle-earth and do not care overly much for the mortals - yet the Wise care and help against Angmar and strike Dol Guldur anyhow (not forgetting teh threat either evil realm has against Elven lands), and that is a bonus, against a foe that even the Valar consider to be the problem for Men (HoME 10).
And in honesty, what would been the result if Glorfindel rode down with some trust blokes and stormed Minas Ithil?
The Nazgűl would flee and as soon the Noldor left they would come back with forces as if nothing happened.
If Noldor set up a base there perhaps Nazgűl would stayed away, but not for sure, with an army decent enough they would come back and kill the Noldor as well as Gondorians, since the simplest Orc can kill a High-Elf just as well as a Dúnedain.
At best the Nazgűl would set up a new base somewhere else, though where they could prove a greater threat, since once they had taken Mians Ithil they more or less stayed in there and almost never came out to cause problems; with Gondorians as neighboors who obviously had ability to hold them at bay the times they do come out.
To let them have Morgul is an unsatisfing solution indeed, but considering the limited resources avilable, perhaps non the less a wise one.