Film Certificates - 15A?

Guillermo del Toro's new film, Mama is being released with a 15A certificate - or so I heard on the radio. So that means that children can go and see the film at the discretion of their parents. To be honest they'd be pretty bad parents if they let a child go and see a film such as Mama.

The synopsis: Annabel and Lucas are faced with the challenge of raising his young nieces that were left alone in the forest for 5 years.... but how alone were they? Creepy, scary things start to happen that are linked to the girls' mother which simply aren't suitable for children to see.

The trailer is scary enough in my opinion and I'm 19:

I think the world is becoming desensitised to things such as language, violence and sex. Just today I watched Men in Black 3, which is a PG, yet they're saying Bulls**t on more than one occasion and I think it's wrong. Maybe it's just me but I think children are losing their innocence during their childhoods because they're exposed to those things that we were protected from when we were children.

12A certificates I can understand but only if the parents know what is going to happen in the film. Quite a few parents took their young children to see the Hunger Games in which children are killing children and were horrified at what was happening on the screen.

12A yes if you've seen it first

15A no, it's wrong and pointless - you may as well make it a 12 if you want kids to see it.