It's easy to give pat answers as to why Lot's wife looked back. But one need look only into their own hearts to find the answer, I think. At least that's true of me.
When one gets intrenched in a certain way of life it is much harder to get out. Your roots are there, you know the ropes, you're comfortable, and after all, we all struggle with sin and temptation. Lot had chosen to live among a people ripe for God's judgment and condemnation. Though Lot himself was righteous, as Peter tells us, he was vexed everyday with the ungodly lives of those in his city. Yet he was hardly on mission, but he was seeking to benefit himself from his associations there.
Lot's wife was all apart of this. How, and what exactly was occuring here, we can't say for sure, though we can know some things in general.
Jesus warns would-be followers of him, that if they are to so follow, they must not be like Lot's wife. There must be no looking back. Jesus makes it clear that it's a matter of giving up one's own life.
We hold on to what we love, don't we? It's hard to give up, even impossible in ourselves to avoid the same end as Lot's wife. Yet that's what God calls us to do.
Only in God through Christ by the Spirit can we do this. And it must be done, or at least ought to regularly be done in community. This is where our sin issues need to be straightened out. Notice in Lot's case, he and his family had no such community there. Nor had they become that kind of community themselves.
No looking back. We need to look one direction: towards Jesus, and the Jesus way of the cross: death to self unto resurrection and new life. A brand new life that leaves the other behind.
What would you add here?
Charity: Wide Open Spaces: Recycled Lives