My take is this: They're not "new sins", really, but the Vatican's way of assisting us in properly forming our consciences, with things to consider that are pertaining to today's world. Just like with the Internet-it wasn't included in our parents time of first going to Confession, because the Internet didn't exist. That's how I see it. The Vatican is doing its job of making suggestions and guidelines for us to keep in mind, for properly forming our consciences, as well as doing an examination of conscience.

There is my 2 cents.