There are 3 responses to this question:

First, we are not more merciful than God, are we? When we ask this question, we are really questioning God’s mercy. We are suggesting that we are more merciful than God. We indict God and place ourselves in the judgment seat against him. But, the Bible presents this picture of God: Lam 3:21-25 But this I call to mind, and therefore I have hope: The steadfast love of the LORD never ceases, his mercies never come to an end; they are new every morning; great is thy faithfulness. “The LORD is my portion,” says my soul, “therefore I will hope in him.” The LORD is good to those who wait for him, to the soul that seeks him. Ex 34:6-7 Then the LORD passed by in front of him and proclaimed, “The LORD, the LORD God, compassionate and gracious, slow to anger, and abounding in lovingkindness and truth; who keeps lovingkindness for thousands, who forgives iniquity, transgression and sin; yet he will by no means leave the guilty unpunished.

Second, we can certainly enjoy a meal, even when we know others are starving, especially when we have tried to give them something to eat but they refused. Those in Hell were offered Heaven but have rejected God and His salvation. They received what they requested.Ro 6:23 For the wages of sin is death, but the free gift of God is eternal life in Christ Jesus our Lord.

Third, in eternity God will heal our broken-heartedness by opening our eyes to the full truth. We will understand sin and its consequences and our part in choosing our destiny far better than we do now. We will know all things and he will remove our pain.

1Co 13:9-12 For we know in part and we prophesy in part; but when the perfect comes, the partial will be done away. When I was a child, I used to speak like a child, think like a child, reason like a child; when I became a man, I did away with childish things. For now we see in a mirror dimly, but then face to face; now I know in part, but then I will know fully just as I also have been fully known. Re 21:4 and He will wipe away every tear from their eyes; and there will no longer be any death; there will no longer be any mourning, or crying, or pain; the first things have passed away.”