Contrary to popular opinion, you do get penalized for sinking neutral shipping. From basic.cfg :
[RENOWN]
RenownReachGridObjCompleted=500
RenownPatrolGridObjCompleted=200
CompletedPatrol=100
NEUTRAL=-1 <--------------------------------------------
ALLIED=1
AXIS=-10
WrongShipSunk=-5000
FirstRankRenown=1000
SecondRankRenown=3500
EndCampaign=-5000
zz
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