Can i get some confirmation/clarification on kayle and morganas lore?

After hearing the quotes they say it sounded like morgana was a good person and kayle although not evil sounding ... seems like a bad guy for not considering anything and just killing those that seem "unworthy"

I thought maybe its because kayle is the light and is very strong with it being that only the truly worthy survive her but then it confused me with morgana ... she seems like a good person who just wants to live amongst people and protect them .. being a shadowy figure that sounded contradicting so i got confused ...

Then i went to the reveal page and it hit me ... theyre both born from justice ... kayle is there with light to seek out justice and killing those that oppose it ... then it hit me that morgana must be shadowy because shes the opposite ... she defies justice and doesnt care for it so she is the shadowy side because she would let those who deserve to die for crimes live because shed just liek to live amongst the people ...

If that is right i actually find that pretty clever and away from a cliche good vs evil thing .. but it is confusing.. please say im right ;-;