No one's going to believe that "Muslims" (BTW, as Kosher as Kosher, they just call it halal) been going out and "rustling" sheep.
I'm well aware of what Halal is. Why do you suppose these rustlers found a use for a wire noose? I'm just speculating here, but hanging the sheep to drain it of blood would be my best guess. That takes time, which increases the risk of getting caught. You'd need to have a very good reason to fuck about doing that in the field. Halal is certainly a good reason. Can you think of another?

And why isn't anyone going to believe it? Someone is doing it, there is financial motive. People are talking. Now maybe the Shropshire farming community are all a bunch of Islamophobes, or maybe someone has seen something that we're not reading about in the newspapers, and word gets around. Further, this isn't traditional sheep rustling. The nature of these incidents is a new problem. Also, Halal.

Treat criminals like criminals and everyone else like a non-criminal and you'll be fine, IMO.
We're not fine.