Well, there's no reason why spiders shouldn't have human protection. There is an SSSI in Mid Wales (Ystwyth Valley) in which the unusual spiders get a special mention - it's a post-industrial area as there was lead mining in the vicinity about 200 years ago and the residual lead pollution has lead (ha!) to some unusual species taking up residence.
But so far as I know, the garden cross spider is pretty common. It's just that they are such beautiful, fascinating creatures that I would rather not harm them if I can possibly avoid it. If that means drying the washing indoors for a few weeks in September every year, then so be it.
I noticed 3 webs in our garden this morning, all with their owners sat in the middle waiting for lunch to fly in.