A man in that position would also be able to abuse safeguarding protocols to keep a spouse in line
'I'll report you for abusing me/my child and then you'll lose your job, be publicly humiliated and never work again'.
That's one reason why teachers and school staff frequently won't report, as the repercussions their abuser could bring upon their head.
In addition, capitalising upon inherent misogyny (such as governors not wanting to recruit a woman with 'issues' or questioning her judgement 'She couldn't identify an abuser in her own life, how likely is she to be able to protect children/do we want somebody who has been the subject of reports/might be unstable?') can be a further weapon preventing escape. She wouldn't have been offered the role had her husband failed a check, after all, would she? Or if she had a caution for assault because she slapped him?
These bastards use every tool they have at their disposal to abuse, terrify, coerce and threaten - including ones meant to protect others.