that is a very interesting justification for those who are in hell. The one thing people who are in hell may have come to know very well is "Finality". There is no free will in hell, only the continual payment for sin and rejection of Christ. when you break the law you go to court and are judged if you are found guilty you have your freedom taken from you and then you are placed in prison to serve out your time, in this case, the reaction of christ will have you there for ever. Is there regret in hell? I think so, can one say I'm sorry? I think so, however, just as those who are in jail today surely have regret, and are sorry many of them will never get out.
There is a payment for sin, and Jesus is the only way out of it, if you reject so great a salvation, doing so, will be the most foolish thing to have done once you have died. The only thing you have then is Judgment.