Why exactly was David watching Shaw's dream? Was there some motive? Or was it be

My question is simple, but some background is required first. To introduce the topic I'll reword it again quickly to show what I'm getting at. What was the true motive behind David watching Shaw's dream? Was it simply something the filmmakers thought was "cool"/"creepy" of David to do with the dream helmet? Or is there much more to the purpose behind this and the dream helmet technology itself?? We know David was communicating with Weyland in cryo and the dream helmet serves a purpose for that. That's it's main purpose it seems--using it to communicate with the subconscious while someone is in cryo. Let me be clear I believe all of Prometheus actually happened in the real world, but that Shaw could very likely have been influenced subconsciously. Every piece of technology has its purpose, which contributes to the form it takes. Form is closely related to functionality. So once a basic blueprint that works is discovered, it can be repeated and applied in a more widespread way. With slight alterations. In archaeology we can see the advancement of tools over time, but tools designed for certain things retain their basic characteristics. The same is true about a lot of technology in general, but the trend with our tech is to make things smaller and less noticeable, but to still perform the same function. Anyway what I'm talking about may relate to this in abstract ways. Once that dream helmet was created it's very unlikely they gave up the technology. But I won't go into that yet. In case you're worried again I don't believe Prometheus was all a dream in anyway, however, I believe there is a lot more to the subconscious communication with Weyland angle. More than a lot of other things. And David really could have had a purpose for watching Shaw's dreams. I mean logically would he really be doing it if he wasn't programmed to be evil, or do weird things like that? He may have even had some freewill over choosing to watch her dreams if there is no purpose behind it... So what is the purpose? Why would a machine do certain things like exercise or watch her dreams unless it has subroutines to allow some choice in what it does that pushes it towards the programming. And are there other purposes we'll see the dream helmet return for? The mind is an interesting thing. And our subconscious even affects the way we interpret things. Part of me really feels that has a lot to do with the happy birthday viral when they ask David what he sees. "Because you know sometimes words have two meanings" Paradise means many different things and brings about a few themes and concepts, not only heaven but other cultures' ideas of heaven. And even ideas about the garden of Eden. So to Shaw Paradise is what she wants it to mean. Which is closer to the idea of heaven, and she wants to climb that stairway to heaven. But this is an idea planted by her father. That she can choose what it means, and choose what she believe David may mean by "Paradise". But David is aware of this. He knows she will take certain meanings from certain things. He also learns a trick to get around Asimov's laws by learning to choose what he believes... If he can trick himself into believing he is not telling a lie, by using words that have multiple meanings, can be taken certain ways, and uses unclear or ambiguous answers to get away with what he's doing. Which may be subtly manipulating the crew and the audience even more than Weyland could have ever dreamed of. He chooses to use the word Paradise in the deleted scene because he may be leading her to draw a certain interpretation from it. And subtly manipulating the crew in many other ways based on the words he chooses... "Poor choice of words" may be the closest thing to a lie he gets away with telling. And it may be not so much about the dream helmet, but the subconscious in general.