I strongly disagree about what you have said, because even if it is a trusted sites, you don't know them personally, and you don't even know what they are going to do with your "personal documents" that you have said, it is just about playing safe in this vast internet world by not giving personal information that fast without thinking what might possibly happen.

The worst thing scenario by giving your legit personal information online is that they could use it on something that is not right, like they are going to use that to pretend as someone to scam somebody, or even worst than that.