Is Erin really a bad-ass to root for?
From the very start of the film Erin was the character I liked the most and was rooting for, and as soon as she revealed her super-survival skills and started kicking the psycho-killers' asses, and doing it in a way that ensured that instead of simply seeming dead they were actually dead, I was cheering her on even more.
But far form being the #1 bad-ass female horror lead as voted for by 'Total Film' magazine, I think we're actually meant to consider her actions in an ironic sense as completely unnecessary and borderline psycho, because ultimately, Crispian and his cohorts had no intention of killing her off. Her actions were to no avail as she would have been allowed to live anyway, and instead of being able to save any of the innocent members of the Davison family, she in fact added to the kill count by inadvertently killing an innocent cop.
In fact if Erin wasn't such a psycho and had spared Chrispian so that he might be able to answer for his actions once the cops had arrived, she wouldn't have been shot by the cop, the cop wouldn't have ended up falling into her trap, and she wouldn't have been suspected of being responsible for wiping out the entire family and their neighbours, as the credits sequence implies.
So, so much for being a 'bad-ass'.