I'm pretty sure that they didn't make an all-male cover because of "political correctness". That'd be like wanting to get to the north pole and walking south.
I guess that opinions differ on the DH1 cover's assassin. My wife is strongly feminist and she didn't mind the cover; she even played an assassin in our first game. She didn't see the DH1 cover assassin as cheesecake, although I get that some people could. However, she does see the new cover's lack of inclusion as a disappointment. The people in this thread might disagree about what good inclusion looks like, but I think we'd mostly agree that no inclusion at all is a bad thing.
I think the reason why cps reacted so strongly is that we want women to be included because they're people, and not just because we think they're pretty. Your initial post could have been interpreted the second way, and I think cps took it that way because that attitude is unfortunately way too common.