Sadly, Hetty, people really don't care
Something of a generalisation, nightowl. You may be right that Woolovers can't guarantee the provenance of their fibres, but that doesn't mean that nobody who wears cashmere is concerned about the goats.
Here is a list of 5 goat-friendly cashmere garment suppliers and there are others. PETA is not known for being impartial!
1. Cocoonu – sources from Outer Mongolia.
2. Johnstons of Elgin – has joined the Campaign for Wool, which supports the "universal sustainability" of wool.
3. Izzy Lane – sources from goats "lovingly cared for in the Scottish Borders".
4. Crumpet – sources from small, free-range farms in Asia, then hand-knits in England.
5. Brora – sources from community collectives in Inner Mongolia, then mills in Scotland.
Or you can do as I do, and knit your own.