“Punish the Deserving” suggests an urge to inflict punishment, maybe even pain or death, on those you you personally deem deserving. “Judged by XII and Carried by VIII” is about how you would rather be Judged in court by 12 jurors for crimes than be dead and carried by 8 pallbearers. That’s not in itself an uncommon opinion, probably, but to get it tattooed explicitly suggests a fixation on the idea. It suggests that they value their life over upholding the law and will take whatever means necessary to preserve their life even to the point of deserving to be tried for their actions, which is not a great mindset in a person trusted to put themselves in danger and uphold the law. “Only evil need fear me. The shadow is mine and so is the valley.” Again this gives the impression of a fixation with dealing fear and retribution to those he judges as evil. “One day as a lion” is a part of a longer quote from Fascist dictator Mussolini, “better to live one day as a lion than 100 years as a sheep” and is about being a victimizer rather than a victim. That is all on top of the connection between the far right and Nordic tattoos mentioned by others.
None of those sentiments in itself is incriminating or anything. But they do shed light on the general mindset and worldview of the officer in question that, paired with his actions (multiple instances of shooting people in the head), can suggest a criminal intent or liklihood to repeat his criminal actions.
Does it have to be an individual fey? Could it be an entire coven? Could be interesting to have your warlock be the charge of, say, the Hourglass Coven. They each distrust each other and want to get one up on the others all the time, so they could each be using you to fuck with the other two all the time, essentially giving you carte blanche to do as you want as long as you are constantly a thorn in the side of all 3.
Could even flavor your spells to take on the aspects/traits of one of the three, like that individual hag has given you that specific spell. Divination and control magic from Endelyn with something like suggestion or hold person controllingthrough puppet strings. Skabatha can give you summoning spells and enlarge/reduce with all effects appearing like wood carved toys. Bavlorna gives you all necrotic magic and polymorph with the forms they take looking like stitched together Frankenstein-esque monstrosities.
Or maybe your Patron is specifically Baba Yaga, but she tasks you with being the Hourgalss Coven’s errand boy while also being her eyes and ears on her daughters’ activities.