Objective things can depend on intention. For example, it is wrong to murder babies. If you put Guinness into his bottle intending to help him grow up big and strong, you are not murdering the kid even if he dies. If you put Guinness into his bottle knowing he has Sprue and intending to kill him that way, you are murdering the kid.

So either way: murder is objectively evil. Intention matters to whether it was murder.

Similarly, it is objectively evil to throw someone off a ship if you think she can't swim. However, it is objectively hilarious if she's an Olympic swimmer who just stole your dress.