Before I start, by "Raws" I'm assuming they simply mean all the unculled, unedited photos. I don't think there's really many clients out there who want NEF/CR2 files. And if so, they'll be photographers who understand what NEF/CR2 are and so it's not really an issue and my answer doesn't change.
In my day job I'm a company auditor - and it would be an absolute NO if the client asks us for a copy of our workpapers, or even a PowerPoint or Excel version of our final deliverables (audit report etc.). It exposes us to incredible amounts of risk - i.e. is our final report based on the correct data used, correct methodology etc. Basically it even exposes the firm to litigation.
So I can definitely understand why some people feel insecure about giving unedited, unculled photos, all creative elements aside.
However, I also cannot ignore the fact that EVERY client I have given those photos too has thanked me for it and found valuable photos that I had deleted/disregarded, even though I deliver 1000-2000 photos per wedding
So if they ask me for it, I do deliver them the unedited, unculled shots.
And besides, if I was really worried about the risk factor, I'd just ask them sign a disclaimer.