Just because the the line between right and wrong might be nuanced or hard to find doesn't mean it's not there.
If it's nuanced then it means it's subjective and not objective surely?
Nuance can be due to variables that are hard to measure, yet are measurable. It's still objective. Objective simply means that two observers applying the same system would come to the same conclusion. Objective does not mean that two observers have to agree the system in question is the right way to make a moral choice.
For example suppose some states that the moral choice is the one that results in the least suffering. In principle, deaths and illness can be measured, there are objective tools to measure pain, and physical and financial resources can be quantified. If the proponent states what specific value they place on those measurements, then they have created an objective system. In practice it would be very hard to gather all the necessary data, but the principle remains.
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