It's a tricky one, and I suspect more nuanced than either side of the argument would imagine.
I think the argument that 'We're just prudes in the UK, in other countries it's fine for everyone to socialise naked' is a bit of a red herring, because yes, while that might be the case, nudity in places like Germany or Scandinavia is generally for very specific situations - saunas and steam rooms, getting changed at the beach etc. People in Germany would be fine with nudity in some situations where it was considered a necessity, but not 24/7 like at a nudist campsite. I had a lot of German and Norwegian friends at university and while they saw no need to cover up for certain things, like a spa or whatever, they would have been utterly appalled at the idea of spending their day naked with a bunch of strangers, playing tennis and eating a meal and popping to a camp site shop to buy groceries.
I'm not suggesting there's anything sinister about the average naturist's motives, but I guess what isn't ever clear to me is why being naked is SO much better than wearing shorts and a t-shirt or a loose summer dress that you would actually make a point of theming your entire holiday around it. The idea of being naked in some situations, like a sauna or in a gym changing room or getting changed on a beach like in Germany, seems reasonable to me. But that's a different thing entirely from making it the sole purpose of your holiday. That is quite some dedication to wanting to be naked and to wanting to be around other naked people. There has to be a motive there - again, not saying it's sexual at all. But it's certainly something more than 'Oh, we're just not prudish about bodies'.
I also think kids should absolutely be given a choice about this sort of thing.
OP, you don't mention how old you are in the family photos. While I know my parents have got loads of photos of me as a baby/toddler where I'm naked in a paddling pool or the bath or whatever, which seems fine, I wouldn't be happy if they had a load of photos of me naked when I was, say, primary school age.