Concept:
Criminology examines various triggers for crime, including psychological state (mental illness) and environmental factors (socio-economic status).
Step 1: Evaluating Assertion A.
It is true that mental illness can be a factor that propagates criminal behavior in some individuals.
Step 2: Evaluating Reason R.
It is also true that many scholars, like Heather, argue mental disorders alone aren't sufficient causes and that socio-economic factors are major determinants.
Step 3: Determining the relationship.
While both statements are factually correct within their academic contexts, Reason R acts more as a nuance or a different perspective rather than a direct explanation for why mental illness leads to crime as stated in A.