Because, in the scheme of things, the MM assocation is the only reason these 5 charges are actually on our radar. Were she not, only the Hazel Behan charge would likely be generating media attention outside of Germany, and even that would be low key and confined pretty much to Irish press.
RSBM
I do wonder if they located Berhan by looking at similar rapes in that time period or whether she came forward via the publicity? I presume trawling through similar cases in Portugal is one of the things that have been doing.
As for the rest of your sentiments I agree.