What is that opposing view?
Oh dear lord, the comprehension is not strong with you is it.
An opposing view would be that men are allowed in women's spaces. That's not a view I hold.
An alternative view to this particular situation is, that the merits of this particular case are not as strong as one may think. Not because the man should have been in the room, but because the background of this case is far muddier than that. Where you have allegations not related to the changing room which have led to a suspension, this case isn't the panacea. There needs to be a strong, clear case raised against NHS Fife, (or the Scottish Government, whose guidance they are following) so that the issue of single sex spaces can be resolved.
And, if after reading this post, you fail to see that, then I can't help you. If you all fail to see that, then it seems what people say about this issue on Mumsnet is actually correct. Nobody wants to find a solution, they just want to shout about the problem.