4 ideas
Laidlaw's colleagues treat the case as not worth pursuing. By following it he traces a line from the city's gutter to Veitch, a vanished middle-class university student whose private papers condemn society, and to his entanglement with the Glasgow criminal underworld.
A society's moral seriousness shows most clearly in how it treats the deaths of people it considers worthless. When institutions triage by social standing, the derelict's murder goes uninvestigated, and that tells the powerful which lives can be removed at no cost. Insisting that the drunk's death receive full attention is therefore a political act, not merely a sentimental one.
Street violence is read as the visible end of an invisible structure of deprivation, humiliation and lack of options, not as individual depravity. The fist in the pub and the respectable indifference of the comfortable belong to the same system. The polite version simply never has to get its hands dirty.
A comfortable person can theorize passionately about injustice while staying insulated from what it costs to live inside it. That gap turns idealism into a kind of tourism, with moral outrage on paper but no accountability in practice. When such a person collides with the real world they claim to champion, the results can be destructive rather than redemptive.