This is because they have not actually stopped to consider it before.

I didn't stop to consider where our relationship was going.

Once more on solid ground Michael stopped to consider what he should do next.

They evidently didn't stop to consider who might want to come.

Has anyone stopped to consider the consequences when we have 20-year-old high school students in with 14-year-olds?

Seldom did he stop to consider the greater world within himself.

Have you ever stopped to consider how grace is given to people?

But has any one of you stopped to consider I've just lost a fortune?

But have you stopped to consider how much it's actually worth?

He had not the time to stop to consider it, though.