1980s Aussie rockers liked laying down sparse grooves that if not so danceable, might also seem like unfinished demos. The song is widely thought to be a message of patience for eventual acceptance of mixed-race couples, and perhaps back in 1984, this was considered less acceptable.
The reference to “original sin” may be a Biblical one. In this context, original sin typically refers to the fall of man with Adam’s rebellion in the Garden of Eden. But given that the verses refer to murder, perhaps singer Michael Hutchence had something else in mind (some online interpretations of this song think it is about colonization in Australia).
Whatever, how about the message from INXS is to treat all people equally?