The more I watch Prometheus (2012), the more I am confused with the beginning of the movie when an engineer is seen drinking that black liquid which turns out to be a chemical weapon to destroy all humans on earth.
There are many discussions online regarding that scene and the consensus is that that engineer went to earth to drink the black goo to spread his DNA for life to start on earth. However, very clearly, throughout the movie, we get to understand that that black goo is, in fact, a chemical weapon of sort, or at least a DNA catalyst.
The engineers were clearly an advanced species so why would they send one of their own to die just to create us? Surely they would be capable to use their DNA for the creation of life in easier ways.
There is a slight hypothesis in the movie that there were some differences of opinion in their society. Can we entertain the fact that, like in all societies, some were "criminals"? Is the engineer at the beginning of the film one of those sent to be terminated, using the black goo?
Some of his DNA manages to tear away from the goo and survives. Was it by pure chance that terrestrial life was created by the engineers? They clearly returned to see us throughout our evolution to possibly realise we were not worth being created?
And why are we so different from them physically?
Is there any evidence from the production team at Brandywine, or even Ridley Scott himself, to stop the speculations?