Re: Pandora's box?
Not sure that is a good point to make. Wool naturally falls from sheep and shearing just accelerates that process and is beneficial as the result is more comfortable (obvious the process the sheep go through is a little distressing, but done well most of them seem to bleat quite merrily afterwards.
It's a bit like using human hair after a haircut, no animal died to use it.
Some of the more headstrong vegans may feel we have no right to remove the wool or that buying it supports the exploitation of sheep products so helps the overall industry, but many don't and no "principle-based" vegetarian will care, I would assume.