While the actions of Kato are more serious in principle, I would recommend informal reprimand absent specific reason to believe that informal addressing of the matter might be insufficient to achieve the desired result in the future. Officer Ramos did not violate any ethical or legal standards. His excessive detail in his police report is a routine matter of report writing proficiency common to young officers. Nevertheless, Ramos could be counseled informally as to the need to distinguish between relevant and irrelevant facts, particularly when unnecessary details could potentially expose the department to civil liability or other officers to unnecessary formal departmental scrutiny when informal counseling off the record would suffice to resolve apparent misunderstandings or miscommunications in the field.

Why are cases such as the one described here of importance to the public?

Discuss the competing interests involved in this case.

Cases such as the one described here are important to the public because failure to effect arrest where justified, or where specifically required could have grave consequences to public health, safety, and welfare. This is particularly important where the call for service involves physical...

This is precisely the underlying rationale for mandatory domestic violence arrests in many states.
Graves' competing interests consisted of following departmental procedures and state law on one hand, and the desire for the respect of her fellow and more senior officer who was once her FTO. Kato's competing interests where his obligation to follow procedure and law against his sympathy for a neighborly acquaintance. Ramos did not have any competing interests in this case.

Failure to arrest subjects after investigation discloses sufficient evidence of domestic violence could conceivably have tragic results shortly thereafter. Had the arrestee seriously harmed or killed a family member on June 22nd, the failure of Graves to arrest him on June 20th could have had serious ramifications to the department in terms of civil liability.

In a more general sense, both Graves and Kato require reinforcement of the importance of following department policy, procedure, and state law, even in the face of complicated circumstances where sympathy might conflict with execution of duty.