The thing is, as in all walks of life, there are extremes of opinion. Most people can be for or against hunting and treat it in an adult way in the same way that some people feel strongly about whether a bacon butty tastes better with tomato ketchup or brown sauce - you can disagree but it's not worth getting aggressive over.
A good example of this is ohmychrist's accusations. In one swoop she has labelled ALL people who hunt as disgusting, psychopathic, trespassing liars. Which is very extreme.
As for calling hounds off a fox - of course they can do it. A good huntsman should hold his hounds by what they call the 'golden thread,' i.e. an invisible bond between man and hound. I have seen hounds called back many a time. Obviously accidents do happen, but the only time I have ever seen a huntsman fail to call his hounds back in time was when they were returning to the horse boxes at the end of the day and a group of sabs well-known for their aggressive behaviour and violent, often law-breaking tactics somehow managed to chase a fox out from behind a rhododendron bush by the side of the road straight into the jaws of the oncoming pack of hounds. Was this a coincidence, an accident? Or was it something far more sinister, and was the fact that they had a camcorder trained on the whole event lucky or planned? Who knows?
You won't find a normal hunting person who condones deliberate breaking of the law, or trespass, or aggressive behaviour. I've hunted with 9 different packs in my life and the majority of people are just enjoying a day out in the countryside on their horses (or in their car) with their friends. I have come across unsavoury hunting characters, but they are the kind of people who would make unsavoury characters whatever they were doing in life, and most people give them a wide berth.
The fact remains that since the law has changed most hunting folk have adapted to the new laws with good grace. Any friction between them and antis comes about because even when everything hunters do is within the law, we are still harassed and pursued by those who feel the need to 'police' a legal activity that the police are content is being done within the law. We actually find that if the police are sent out to a major meet, such as the opening meet or Boxing Day, they thoroughly enjoy themselves as the atmosphere is good, every (except the scowling sabs) is happy, and no laws are being broken - they are generally there to make sure the sabs don't spoil it for the rest of us.
Of course, everything I have written above - a reasoned post by a responsible, law-abiding hunter, will be ignored by those who disagree! So ignorant are many of them (and willing to believe anything they are told by the likes of LACS) that they are only able to reply in short bursts of aggressive accusations. Even my bloodhound following friends have had confused people wind their windows down and shout 'disgusting scum!' at them when bloodhounds have never, at any time, hunted anything but a person jogging.