Continuing on Slasher Horror

In a Slasher film,the killer almost allways uses unconventional weapons,such as knives,chainsaws and various blunt objects.
There is often a backstory that explains how the killer developed his or her violent mental state,and why he focuses primarily on a particular type of victim or haunts a perticular location.The killer is almost allways male,and is often able to withstand most or all of the victims attempts to defend themselves.
While the killer is usually portrayed as "pure evil",there are some films which shows the killer to be apitable,or at the very least misunderstood.