I don't think that particular advert is promoting paedophilia, it's fancy dress FFS.
I like snag tights, especially their footless cropped tights and shorts - very comfy under a dress in the summer. I also like the fact they sell lots of different colours, not just black and shades of brown.
Sometimes their adverts are a bit off the wall, but it gets them noticed and pretty much everyone has heard of snag tights, so a successful advertising campaign.