Most of this thread seems to be about landing at a Capital City Controlled (Primary for us olde dogs) aerodrome. Arguments that one lands without a clearance at uncontrolled aerodromes or GAAP aren't really relevant to the story.
Whilst the rules are for the guidance of the wise and blind obedience of fools, unless there's a good reason for not executing a missed approach, as espoused by
Desert Dingo on p5 of this thread, I don't think "I thought it would be ok", or "I thought the runway was clear", or "I didn't see any other traffic" stands up as a sound reason to land without a clearance. Nor does "I didn't want to worry the passengers by executing a missed approach".
IMO at a primary aerodrome, with SMC and TWR on discrete frequencies, landing based on the aforementioned assumptions, is a recipe for disaster.
