Well thats to bad. It fit so well with the V + Z theme.the picture of melania standing behind trump signing something could be fake, as i have not seen such a picture on yandex
Trump was being sworn in before Melania made it to his side with his Bible. The reason Trump didn't put his hand, then, is because Chief Justice John Roberts forced him to do it that way.
I heard a possible reason why Roberts did this. The swearing in of the new POTUS is traditionally done precisely at 12 noon. Roberts wanted to be exactly on time and he thought things where moving to slowly. Trump was sworn in at 12:01, waiting for Melania would have made him even later. It's funny how this exact time is so important, more so then the Bible apparently. The Bible isn't a constitutional necessity for swearing in.
Now this can be used for another social uproar.