To think 15 years is not long enough...

[coconuttella]

... for this sickest of crimes. A full life wouldn't be long enough for this evil bastard....

www.bbc.co.uk/news/uk-northern-ireland-39489348

No, it isn't. But no time would be enough to really 'pay' for what they did. However, he is 61 and will (from the sounds of it) actually serve 15 years, which takes him to 76, with a further 5 on licence. In terms of protecting the public, it's enough. He may well die in prison.