The validity of subjective morality doesn’t follow from the invalidity of objective morality....because both could be wrong , and because there are other options. Admittedly , you didn’t argue that explicitly … but you didn’t argue any other way. Other options include societal definitions. Societies put people in jail for breaking laws which delimit bad behaviour from.good behaviour, so something like deontology is going on under your nose. If the jailing and executing isn’t justifiable by your morality, then it is a gross injustice.
The validity of subjective morality doesn’t follow from the invalidity of objective morality....because both could be wrong , and because there are other options. Admittedly , you didn’t argue that explicitly … but you didn’t argue any other way. Other options include societal definitions. Societies put people in jail for breaking laws which delimit bad behaviour from.good behaviour, so something like deontology is going on under your nose. If the jailing and executing isn’t justifiable by your morality, then it is a gross injustice.