Your argument is terrible Stephen.
If you dismissed the teaching of anyone with sin in their life, what you describe as "bad histories and guilts" then we'd have to dismiss every single bible teacher in all of history, as every man is a sinner, for example, the Apostle Paul, the chief himself. A mass murderer and persecutor of the church.
As an FYI, regarding Calvin and and the death of certain heretics such as Servetus, everyone should know that Calvin merely served as a witness in Servetus' trial. He was not judge, jury, or executioner. Servetus was already on the run from another country with a death sentence on his head. He was captured and held trial. Calvin's job was to simply serve as a witness in the trial to prove if the allegations against Servetus were true. Servetus was put on trial by Genevas Little Council of Twenty Five. It should be known that this Council was not friends of Calvin, but his enemies.
Servetus, also being enemies of Calvin, was arrogant and confident in the trial, since he figured the Council would side with him against Calvin. His arrogance led him to not give a substantial defense for himself, instead opting to lob insults at Calvin. However, Calvin's calm, cool reasoning and expert logic caused the Council to find Servetus guilty. Servetus was shocked and couldn't believe it. (Let it be known that
four other cities also recommended a verdict of guilty)
Some other things you should know:
Calvin pleaded with the Council to issue a beheading rather than a burning at the stake, but his pleas were denied.
Servetus, too, believed heresy justified the death sentence. Death for heretics is not something Calvin invented but was part of the culture at the time.
Calvin had no political power, being a foreigner himself.
Calvin didn't want Servetus to die, but to recant of his errors. He spent time with him during and after the trial, trying to convince him to recant.
It wasn't Calvin's decision to burn Servetus at the stake, but Geneva's Council of Twenty Five.
The belief that denial of the Trinity justifies a death sentence is not something Calvin invented, but was rather simply a medieval inheritance that everyone believed, including Servetus.
We constantly see people using the Calvin and Servetus historical event as a blot against Calvin's reputation, which you can see isn't exactly a blot against him at all. Usually, synergists are just repeating what they heard other anti-Calvinists say. They aren't quoting things they learned by actually taking the time to sit down and study the issue themselves. They aren't concerned with accuracy or historical fact. As long as they can make Calvin look as bad as possible, they feel justified in dismissing him and the theology that bears his name. By bringing up this historical event, they think they gain a foothold against Calvinism itself. Ironically, Calvinism has nothing to do with John Calvin, as it comes from the pages of the Bible, and not what Calvin taught.
Thus one can rightly conclude that this ad hominem attack against Calvin is a sure sign of desperation by anti-Calvinists.
To see more information, go here:
http://salvationbygrace.org/uc/sub/qaprint.aspx?qa=113&local=11a