The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at the Trope Launch Pad.
Scorpion451
(Edited uphill both ways)

When a movie has a pointless massacre unrelated/unnecessary to the plot, the target usually being a group of people that are almost unanimously seen as vile such as pedophile Nazis or cannibalistic rapists. The group is, well, TOTALLY MASSACRED! by the protagonist or sympathetic character(s).