Ethics is behaviors. Actions. Activities.
Ethics may be behaviors, but behaviors(lawful/chaos axis) are not ethics. Picking your nose is a behavior. It's not one dealing with ethics, though. Same with having orderly behavior.
L/C is identity: group/individual.
Not in D&D.
From 1e: "Lawful Evil: Creatures of this alignment are great respecters of laws
and strict order."
There we have strict order being a lawful behavior that an individual can have.
From 2e: "Characters who believe in law maintain that
order, organization, and society are important..."
Only one of the three involve groups. The other two, order and organization are easily applied to individuals.
Now, the rest of lawfulness(and there's a lot) in 1e/2e does focus in group and society, but after those editions alignment changes very clearly to one that allows both individuals to be lawful in and of themselves, or group think to be lawful.
I've quoted 3e and in that one lawful is very clearly individualistic or group.
4e also mentions personal codes in LG.
Aaaaand in 5e... "Lawful neutral (LN) individuals act in accordance with law, tradition,
or personal codes."
You can home brew your game to make alignment like you view it, but D&D by default is what I'm stating.