I find it strange that you say that choosing love over hate, harmony over war, and justice over injustice are subjective personal preferences, when they are not.
The issue is that you accept only one kind of truth, empirical scientific truth and none other, so there is no way to determine spiritual truth. You do not accept logical rational truth. You do not accept experiential, so you do not know what is spiritual truth is.
Lying is wrong and if you have experience the evil that lies produce you would know that they are wrong. Jesus said that Satan is the Father of lies, which means that those who tell lies are doing evil. That is experiential truth.
Jesus said that a tree is known by its fruit. A good tree produces good fruit. This is experiential truth, which means we learn from what we experience, both right and wrong. This is something that you have rejected as unprovable, even though it is real.
The Bible, here Paul, has given us a list of the Fruit of the Spirit: "Love, Joy, Peace, Patience, Kindness, Generosity, Faithfulness, and Self Control." These are the results of a life lived for Jesus Christ through the Holy Spirit. These are not absolute values, they are relational values, but "against these there is no law." They are right and true wherever.
Today the news is of the aftermath of a horrible mass shooting in Las Vagas. Right now people do not know why this happened, but certainly we can say that it is wrong, and not only is a subjective personal way.