Yeah I generally run any non-neutral alignment as "Willing to go out of your way to perform acts of [help/harm], with the alignment being determined by why you did it and whether you feel satisfied by the outcome, and you intentionally do those acts in a [principled/unpredictable] manner."

As a result, most creatures are generally neutral - They may lean in one direction or the other, but a paladin's divine sense will only reveal evil if someone would actively make choices to harm others, feeling no remorse. Any good deeds are an extension of selfishness, done for the purpose of some kind of gain (lawful: gain is calculated or for an existing purpose, chaotic: gain is for whatever they wanted at the time)

A good alignment for a paladin sense means you're willing to make active choices to sacrifice things important to you (or perhaps for your survival) for the purpose of helping others. That can be as simple as giving up something you wanted or as heavy as charging into a burning building to rescue the occupants. (Lawful: does it because it's the right thing to do, chaotic: does it because it felt right at the time)