They're not independent. Sufficient skills can overcome the stigma of a criminal record. But providing prisoners skills usually involves some on-the-job training to be useful.
> Sufficient skills can overcome the stigma of a criminal record.
Not when there's an HR department in between the applicant and the hiring manager. People with "sufficient skills" get rejected all the time for reasons far more benign than e.g. having killed someone 30 years ago.
Like, this ain't about "stigma". This is about Kafkaesque corporate bureaucracy actively driving crime rates.