I can understand the concern.
Damage to the sheep is sustained during normal shearing by a trained professional. Sheep also can, and often do, die after shearing. This is usually the case concerning flocks that aren't used to human contact such as those reared on a station. A person not properly educated in the use of the electrical shear can also inflict much damage on an animal and given that shearing is done in a shed with one bloke in the ring, a public display can be absolutely terrifying.
As someone who has lived in a farming situation, I can honestly tell you that the the shearing process is not the picnic that is often portrayed. The process involves sheep being driven by humans using motor vehicles or dogs from distant paddocks to a shearing shed which, essentially, is tin on concrete under a very hot and relentless sun. They are held in close confinement, often for many hours without food or water and in temperatures exceeding 40 celsius/110 farenheit, until in turn they are caught, turned on their arses and dragged to the shearing board.
People not used to seeing this, particularly those not from a country background, would find this frightening. So I can understand that.
What I find unpalatable is that it would appear that nobody from the farming fraternity has been contacted by these scared people, preferring instead to act alone on their ill conceived ideas and then don't want to be named.
I'm glad people are acting on animal rights. This in itself is hopeful. But it's a shame that two groups who obviously don't understand each other haven't communicated which means that city folk are missing out on a chance for some important education and more serious issues such as mulesing aren't being addressed.
Nobody likes being told what to do.
Until they get lost.