1. I don't have to substantiate anything. I just go on the history of the time, and Calvin's own writing in his commentaries.
2. You are making the accusative statements about Calvin, and I am asking you to back up your assertions with historical citations.
3. Because we have all sinned and come short of the glory of God, and that although saved by grace through faith in Christ, sin is still present with us. There one sinful person doesn't have much credibility in accusing another sinful person. God does not differentiate between one sin and another. It is all the same to Him. He said that the soul who sins will die. He doesn't say that those who sin great sins will die, and those who sin small sins will not. This is why none of us has the right to accuse Calvin, because in the sight of God we are just as bad as he is. And, if he has exercised faith in Christ to receive grace and mercy for his sins, then if we have done the same, then we are in the same boat as he is. So, maybe God may say to those accusing Calvin or anyone else of sin, "Why are you accusing someone who is depending on My grace and Mercy the same way you are? Are you not the same as the wicked servant who, having been forgiven of a great debt which he could not have repaid, goes and gets another servant thrown into prison for a much smaller debt? What happened to that wicked servant? Might the same thing happen to you if you continue accusing others of sin when you have been forgiven of the great debt of sin yourself?" Something to think about.
The question is, do we think we are holier than Calvin? I don't think so. So I'm not going to accuse Calvin of anything, even if he did those things you say he did, because if I did, then God might turn around and accuse me of all the things I have done in my life that has broken His holy moral law.