Crossword Genius

Society collapses after millions lost moral doubts (8)

Ross

I believe the answer is:

scruples

'doubts' is the definition.
The definition and answer can be both related to thinking as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

(Other definitions for scruples that I've seen before include "Feelings of doubt arising from conscience" , "Doubts about the morality of an action" , "Qualms" , "Feelings of doubt produced by conscience" , "Feelings of doubt based on conscience" .)

I've seen this clue in The Independent.
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