Us? You mean "them." right?
The lake of fire, oft referred to as "Hell," exists to also provide the abode for all those among humanity who have chosen to keep their sins upon themselves, to try and atone for their own sins after having rejected the placement of their sins upon Christ. They will be there, as you know, eternally because they absolutely cannot atone for their own sins given that they are guilty of ALL the Mosaic Law and the Law of God. That guilt, they will find out, could only be negated through the Blood of Christ that they rejected.
One other thing that many professing believer doesn't normally talk about in the context of rightly dividing the word of God is that all those who chose to keep their sins upon themselves will go into the lake of fire fully understanding their guilt, and will not all be remorseful over going to that place. Nobody goes to Hell accidentally. It's an intentional choice for all, even those who lived in the deepest, darkest jungles where no missionary had gone to that point.
MM