I have been around Boxers for fifty years and have yet to see one that goes on an unprovoked rampage.
So, which is it? The two stories I posted discussed Boxers going on unprovoked rampages. Just because you've never seen it, doesn't mean it never happens.
I’m sure many long-experienced German Shepherd breeders have never personally seen a rampage by GS, but they’d be damned fools to deny it never happens.