They said they went with him in the end because he suited the character. They questioned their judgment in the beginning but they said they rather go with an actor that fit the part than drop him for a white actor that didn't.
And I agree color is irrelevant. But I can also understand some fans wondering why they went the direction they did, but being as I was never a hardcore fan of Daredevil, I didn't care at all.
Most comic book characters are white because they were created sometime in the 40s-60s, it would have been uncooth and lost them readers had they been championing rights of ethnic minorities. Yes, that's sad, but that's the truth, and I'm sorry. Had Daredevil (or any other hero, actually), his supporting cast and characters been created today there would be a lot more diversity.
Kingpin's a thug from the Bronx (or Brooklyn, I forget which and it really doesn't matter). These days, there's just as much a chance a person of his background would be caucasian, african american, latin-american, etc.
Egypt was a busy land in its ancient times, wherein Apocalypse would have been born. While much African stock lived in the area, they had settlers and traders from Europe and the Mediterranean (Greece--Ptolemy a Greek astronomer would sire a line of rulers the last of which would be Cleopatra--and Rome), also from the Middle East (Babylonia--Iran, Iraq, Afghanistan) and more. So Apocalypse wouldn't be white, as we've too often seen Egyptians appear in Hollywood, but he wouldn't be a "brotha" either, exactly. It really depends upon which region he was born in, the time period and whatnot, but he would probably have some African and Middle Eastern stock in him. For more on Egypt's race relations, check out the " The Leapord's Spots" by William Stanton, which summarizes many other works and takes an interesting look at 1800s American race problems in relation to the rest of the world and the history of the subject.