Although I have no report of lesser vessels sinking a destroyer I can tell you that I have seen DD's mistakenly sinking their bretheren in the campaign. This is both stock and GWX 2.0.
My only guess is the limitations of AI in targeting. And yes, DDs will blow themselves up if they make an attack run that causes them to reverse due to another vessel in their path.
These are very rare occurences in my experience, cheers to ubisoft and the Grey wolves for excellent games/mods IMO.
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I stole this sig from Task Force 
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