Deportation of Al Bangura makes no sense

I have read today that Al Bangura, a young professional footballer with Championship leaders Watford, is to be deported. This is crazy and makes a nonsense of the whole deportation system.
We read constantly about convicted criminals who have had their "human rights breached" because we have attempted to deport them back to their country's of origin. Yet, when it comes to someone from Sierra Leone who escaped at the age of 15, has become a professional footballer, earning a very good living and paying a large amount in tax to the UK economy, which is more than paying his way in society, the UK government attempts to deport him.

This is perverse and illogical, not just on the basis of normal human rights, but economically too.