Live trapping foxes is cruel.
Read the Burns report - like it or not, hunting was actually deemed the most species specific, low cost, viable method of reducing foxes/dispersing foxes.
It isn't the most humane method, that is determined to be lamping with a high powered rifle, which is extremely expensive and runs the risk of shooting something that isn't a fox (child in the hedgerow, some other pair of glowing eyes at the right height).
Shooting is also not safe to do in a lot of places (anywhere the bullet can travel further than intended, cross a footpath or road etc).
All of that aside, fox hunting with hounds is now illegal (fox hunting ISN'T illegal.. you just can't kill foxes with a pack, mind you can flush a fox to a bird of prey, thats fine...) and so I've no issue with hunt observers.
My experience of sabs however is that they are ignorant, and dangerous, with no care for animal welfare at all.
I have witnessed horses punched, stabbed, yanked around, hit with whips to try and get them to rear or fall.
I have seen hounds hit, chased across roads, chased across railway lines, distracted and confused with horns and strong scents, fireworks thrown at them, caught and abducted...
How? Well when I was a stupid teenager I went out with sabs a few times. The main aim was to goad hunters into swearing in your face or ideally, punching or hitting you, get them to fall off their horses or get hounds to cause accidents, all of this to be caught on camera.
I quit when they arranged to go out to disrupt the Cheshire Drag hunt, who hunt an aniseed scent laid by a human runner, and have been purely a drag hunt for over 100 years, their hounds have NEVER chased fox, their hounds great great great great grandparents have NEVER chased fox, they have NO interest in fox at all. They want to gallop and jump fast, all day, thats it.
The sabs did not care, they knew they'd get great footage of angry hunt followers by doing it, and that is their goal.
Anyone GENUINELY caring about foxes would have read the anti hunting bill when it was proposed, read the Burns report and opposed it on the grounds that it DID NOT GO FAR ENOUGH and did not protect animals at all!