S2E9 spoilers.
Spoiler: In his own words, Robert is playing "one more game" with William. We can assume this is a long one which in some way involves the Forge. My guess is, Robert knew William's family would find the profile card (maybe he had a word with Juliet at the party), and one way or another William would lose them. The Forge almost certainly contains a host version of Emily, at the very least, so the natural next step would be to seek out a version of her that hasn't seen the profile, and doesn't know what happened to her mother.
Re. the second point, about leaving the profile card tucked in the book, remember that Juliet's suicide was IMMEDIATELY before the start of the first season. It's the reason he's in the park. So the card hasn't been there for long.