Help to understand V5 humanity?

From my understanding, V5 made an attempt to step away from a clearly defined ladder of morality (and the paths which were attempts at figuring out how "evil" vampires continue to operate for centuries without degenerating into beasts) and instead operate by personal codes. We're all new players and are trying to figure out what would create stains.

I know that the slow loss of humanity is a core part of the game, so I'm trying to curb my metagamer desire to never lose any points. However, I feel like certain things could arguably be justified through convictions for me and other players. I'm just gonna give some examples of things that happened and the arguments of whether or not they're mitigated by convictions.

A Ventrue priest with the "Obey Authority" conviction has a pair of hunters who are trying to kill the coterie as prisoners. The SPC, a sheriff's investigator, says we should kill them. The PC kills one by draining him dry, killing a disarmed prisoner.

Another member of the coterie, after extorting information from the surviving hunter, promises they will be safe and unharmed. After hooding them, they kill the hunter. I feel like this one would definitely cause a stain, but the discussion became "would a conviction mitigate this?" For example, a conviction of "give comfort to the stricken" or something make telling comforting lies more acceptable?

A ghoul recently lost their master and is hungry for blood. After interrogating her, she asks if one of us can supply some blood. Ghouling is supposed to generate a stain, but is that still the case when it's a request by the mortal?

And more generally, if someone is an ACAB anarchist with a corresponding conviction, does that mean cop killing becomes a non-issue? I've seen some people say killing should always cause a stain, but what if it's primary to someone's conviction?

Anyways, I'm sure I'm not the first person to ask this stuff, but the information on humanity seems a little up to interpretation so I'm curious what your thoughts are