And the main issue with single parents is income/income instability (which is why there are focused benefits in many countries for single parents). As ever, an income issue gets classed as something else.
Very well could be a good idea. If the father was in jail because of some youthful drug offenses, it could very well be that he could still be a devoted and loving parent and no danger whatsoever to the child.
Divorce does not always result in single-parent households.
Divorced parents can and do remarry.
Children not encountering lies, strife, or emotional disattachment on a daily basis anymore seems a significant improvement, however.
So the alternative of having one home and more access to both parents could be better for the child even if the parents don't get along with each other well.
As I recall, I didn’t take my parents’ daily fighting, even my mom screaming and throwing things, as much to heart as some might think. I’m glad you used the word access because that’s precisely what I valued most, and the biggest loss. Second to that was the devastating financial strain (2 apartments, 2 cars, etc but same income).