Because warning people about the consequences of persisting their sins is (on this hypothesis) one of the means by which our merciful Lord ensures that it will be no one’s fate.
I do not think it’s orthodox to say confidently that all will be saved. But I do think it’s possible.
Edwin
Some saints would agree with you.
I have never been able to see it that way. Between the many times Jesus mentions not only hell, but many people going there, and the idea that no one takes the Wide path? No, I cannot believe that. And the many inspired works of theology and art that depict it. And the evil I have studied and witnessed. I certainly think Hell is populated. And if I did not think that my vocation as a husband and father would be futile. My job is to get myself, my spouse and my kids to heaven. Navigating that narrow road is difficult. Even with Holy companions, and graces from God and the sacraments. I shudder to think if I did not have those things.
I think going to hell is a real danger, and one that billions of people have faced historically. I hope no one would go to hell. But, the Church, the scriptures, and my own mind tell me that is a false hope.
One final thought.
Catholics do not have to believe private revelations. BUT in the ones that have happened that depict hell, Not one has hell has unpopulated. Not one.
But the ones who have seen hell, like St Faustina, would not wish it on their worst enemy. So while we might disagree about who is in hell (if anyone) we should be fearful of the reality of hell, and the possibility of anyone going there. This should cause us to preach, harder, evangelize, more and speak clearer and more often about this. I doubt very much Jesus would have used precious ink in the Bible to warn about hell so much that no one would go. It would seem strange that we fumble his teachings so often personally and publically and we sin so much as a people even in the 2000 years that we have had a savior known to us to think that in this ONE issue we succeeded and His words were meaningless.