The people stepping over the glass aren’t the people with the legal power to clean it up. In this case, Merkel is involved so she presumably could be leading an effort to reform the law, but most of the time with these laws the fact that police and prosecutors don’t enforce doesn’t really register with lawmakers.
Yeah, I think we often see biased and racist outcomes in the way laws are selectively enforced, but that happens with “good” laws and well as “bad” ones. Rich kids get let off with a warning for their “prank” while poor kids doing the exact same thing would be charged with vandalism/theft/whatever.
I really don’t like bad laws sitting on the books, but if it were an easy problem to fix it wouldn’t be a problem. There are regular efforts at many levels of government to clean up old laws, but even with omnibus bills going on for hundreds of pages we still have laws referring to laws that don’t exist anymore and other egregious errors.