So what you are now advocating is MORAL RELATIVISM.
Calvin's seeking the death penalty for Servetus was just as much a sin in 1550 as it would be in 2008. God is not a moral relativist. Calvin and you OTOH was/are.
Calvin was a tyrant even by the standards of 1550. Just because everyone was a tyrant in 1550, does not mean that Calvin wasn't.
When men like John Calvin and the civil authorities in Geneva look to God’s infallible Word in order to construct just laws for the nation, that is hardly moral relativism. When they read in God’s Law-Word that heretics and blasphemers are worthy of death, and carry out such punishments after due process, that is hardly moral relativism.
Moral relativism is using the antinomian views of the Enlightenment filtered through several hundred years of developing political correctness to judge men who in their day stood firmly on the Word of God. It is quite common today, even among Christians who ought to know better. But Christianity is infected by antinomianism (moral relativism) as well. Just watch all the smiley faces on misnamed "Christian TV" or read any of the numerous Christian "self-help" books.
Your friend Servetus was an anti-trinitarian blasphemer who got exactly what he deserved. His problem was that he lived in a day when Christian men were men and they took God’s Law seriously.
If he were alive today, no doubt he would have his own TV show and Christians would be sending him money.
"And whoever blasphemes the name of the Lord shall surely be put to death." (Lev. 24:16)