'Keeping the fox numbers down' by hunting them with hounds is a completely bogus argument.
It's not a service, it's a sport.
If control of the fox population was really the main objective of the hunt, then it's the most inefficient form of animal control known to man.
If foxes needed to be culled, then a far simpler and cost effective method would be introduced (like the controversial badger cull).
I would accept (although not support) the argument that this is a traditional country pursuit, but I'm 100% unconvinced that the hunters do this for any altruistic reasons.
Oh and by the way - why is it necessary to smear the blood of the downed fox those children who are attending their first hunt???