Because of sin, we all have issues.
God's grace (i.e., unmerited favor, says P. Brad) is more than enough to cover the worst issues. We just have to receive.
Sometimes people don't see that God's grace can cover them or just straight-up think they can't receive it, so then God calls on others to intercede on their struggles and hurts to share the burden. God uses those people to show the power of his love to the ones who aren't accepting God's grace.
God is victorious, and we win. There is healing power in this love!