Genesis 6:5-13. Well it does seem like they had very few options. But I would imagine that as Noah was building this massive ark in the middle of 'nowhere', some curious by standers did ask him why he was making ''an ocean liner in the Sahara'' and they probably laughed him to scorn when the reason was given. Now I am not saying that is what exactly happened but something very similar to it.
I didn't see any options in those verses, but it does imply infants and unborn children were so wicked, that even with our wickedness today doesn't compare to those unborn.