Daffa karro.... sanno keee? It's up to Allah to show the righteous path to whomever He wishes and blind an entire race that he doesn't wish to enlighten, it's ALL entirely up to Him. Wisdom maybe equivalent to your combined life experiences over a lifetime or maybe a function of your IQ / grey matter and time, however, that necessarily doesn't equate to righteous behavior... think about it, if it were, then Abu Jahl would've retained his earlier laqab of Abu Hakkam.
Who am I to interfere in his divine judgements and destiny that he has written for these people. I don't have the moral authority to declare anyone of them a Momin or an Infidel.
Live and let live, the problem will only arise when someone puts a stone in my path.