The activity that those shooters are participating in (live pigeon shooting), while perhaps unsettling to even some veteran sportsmen, is perfectly legal in that jurisdiction.
And videotaping such an event and showing it to a public that will be disgusted by it is how laws develop that prohibit it. Which is their intention.
I think it seems a little selfish to go through the effort to capture or raise live birds specifically to transport them to a range and waste their lives as targets.
They are not just killing some nuisance animal like pigeons are some places, but transporting a live animal to kill for recreation.
The public generally reacts in a way when such things are exposed to create laws that ban such activities.
So those shooters should be quite concerned if they wish to continue such a thing, the video the activists are taking will probably put an end to that activity eventually.
As someone that has been in the poultry business in on form or another most of my life other than my 6 years in the service, I have gotten more than fed up with these people. They label the farms as cruel in general, and they certainly see every aspect of getting the birds from farm to store as cruel. If it was up to these groups poultry would be grown open range, caught gently, put in a padded box for transport, killed in a gas chamber (which suffocation by gas seems so much less cruel than the current method of being hit by a high voltage blast of electricity that fries their brain instantly), then hung and processed after they are gassed. I wonder what the price of chicken and turkey in the store would be then since it would be a pretty rare commodity.
This is true, many activists have standards for animals that would increase the cost of meat to well beyond what it is today. Putting it out of reach of a lot of budgets. The activists don't mind because many of them are vegetarians or eat little meat anyways, so something more expensive they don't plan to buy does not impact them.
Although some of the things done to animals when they are seen as nothing but a dollar sign are quite cruel. Lives that are never lived, and then killed for profit. People that kill something all day also cannot allow themselves sympathy for the animal or it would make the job difficult, so they become cold and indifferent to its feelings, which can allow for more cruelty.
So some pressure on the industries can be a good thing to remind them to be humane.
I should note that cameras are an easy way to tell only the part of a story that benefits the narrator. They can edit out all the parts where they harass, use foul language, and cross the line in disrupting events, ruining hunts, etc Then show all the footage where the angry people they are harassing finally lash out or show poor self control, while the person doing the filming looks innocent and just trying to film.
The individual filming can have poor self control for hours and most of it is never shown on film, and the people being filmed only have to misbehave briefly and every moment of it will be shown.
They can harass groups of people for days or weeks, then compile a video of the few instances where someone lashed out at them over that period of time.