If calvinism is true, no one who ends up in hell has any reasons to regret anything about his previous life on earth. How could he? God predestined him to be non-elect before the world began (according to calvinism) and that means he had no option but to BE a non-elect and thereby doing the will of God by being exactly what God intended him to be. And how does a non-elect person behave? Well, among other things he rejects God, he is rebellious and he is a non-repentant sinner. So this means that God WANTS him to have these attributes. Most calvinists believe that “God predestines whatever comes to pass” so to be consistent this must include predestining people to sin. Yes, many calvinists say that “God predestines everything, but man is still responsible for his sins”, but this is an oxymoron. And when they are told they believe in an oxymoron they say “God’s ways are higher than our ways” or similar. If I say that I believe in the trinity but not that Jesus is God, this too is an oxymoron.
If calvinism is true, then SIN has nothing to do with why a person ends up in hell. Always remember that a person (if calvinism is true) is predestined to be elect/non-elect before the world began, and before he was even born. So by the time he gets born he is already doomed and he WILL grow up to be elect OR non-elect depending on whatever God chooses, and he WILL act accordingly. Calvinists often say “No, God didn’t predestine them to be do evil, because left to themselves they would never choose him anyway and they would only want to do evil”,but is this the whole truth? WHY don’t they want to choose him and why do they only desire to do evil? That’s because they are non-elect, right? And who chooses that they shall be non-elect? GOD does, according to them! Those who are not chosen to be elect are by default chosen to be non-elect. Man himself is therefore totally innocent for his actions in my view, and some are just unfortunate enough to be chosen to be non-elect which inevidably will lead them to be and to do evil.
If calvinism is true, then Jesus did not even die for some people but their God will apparently send them to hell just the same, due to that they reject Jesus. (Or was it because he predestined them to be non-elect and Jesus-deniars before the world began?) Why is it a sin to deny that Jesus died for you if Jesus did not die for you?!
The Bible is loaded with examples of people rebelling against God and suppressing the truth. Do they do this out of their own choice OR according to the will of God? It’s one or the other. The most obvious answer should be that people have the choice to obey but sometimes choose to disobey. God doesn’t want people to disobey and rebel against him, but due to his decision to create man with free will, we are able to make our own choices. Most importantly we will be judged based on our decisions and actions since we are response-able. If God predestines people to rebel against him and to suppress the truth, it wouldn’t make sense for Him to punish them for doing what he forces them to do.