Guttenberg made his invention in the 1440's. Luther came along in 1517. 75+ years is a span of 3-4 generations. Not exactly simultaneous events, but then, hey, what's a little historical fact when it gets in the way of attempting to score points?
Alex6's corruption was in the late 1400's.
I haven't really looked at those immediately prior to him, but the few after him (excepting Adrian who died about a year after his ascension) were also seriously misguided.
If they weren't paying off bribes with indulgences, they were sending armies against innocents or wracking peoples' bones in dungeons.
I wouldn't trumpet them as the standards if I were RC and could avoid doing so. I'd just admit they were corrupt and drive on.