The allies fought together in WWII because the axis attacked them. The genocide not only had nothing to do with it, war decisions were explicitly made to leave intact the concentration camp system (for example not bombing railroads that took people to the camps) because any whiff of supporting Jews would have damaged political support for the war. The people in the camps were only freed at the very end of the war.
The allies were the same countries that crippled Germany’s economy after WWI, leaving its society vulnerable to the demagogery of Hitler. I don’t believe they can be black-and-white described as “the good guys”.
Wikipedia says /ˈkwɒkə/ which I think was your original pronunciation.