Board Thread:False Info and Speculative Discussion/@comment-7603754-20160309202205/@comment-26879545-20160329201356

^ That depends on the circumstances. Assuming the criminal is armed and dangerous and ready to attack Stiles, as well as if Stiles can provide evidence and defend why he thought he had no other choice, then it's self-defence (basically a similar situation to the one Scott's dad was in; the Chemist was about to kill a minor and it was either letting the minor die or shooting the criminal).

If Stiles shoots them just for the sake of shooting them, then he has some explaining to do. Not only to Scott, but to the Sheriff and/or the higher-ups.