This whole credit page controversy has flown right past me and quite frankly I prefer to remain ignorant.
I do remember some utterly tasteless credit pages, most were just your tipical teenage edgelord stupidity, some seemed to be taken directly from /pol/, complete with toxic idiocy and all. I was never offended, just saddened at what an utter train wreck the latter ones were. I think their removal only helps enjoy this manga. Mainly because of the mood whiplash they caused.
As a final thought, let's just appreciate the fact that the guy's online handle was rapeman.
Nothing of value was lost.