Because you have no reason to assume they would tell you the truth, or that they are not lying even to themselves. Actions speak louder than words, and 99% of women who attain financial and physical security choose to not have 14, or even 4 kids.
See here:
> Imposing measures intended to prevent births within the group;
As recently as the generation that was born before WWII, even the Boomers, were born into relatively large families. The idea that they hated having so many children would have been foreign to them. On the contrary, it gave them meaning. Family and community life was vibrant. Now, things are desolate. We live in a culture of death.
No one tells them they cannot have 8 or 14 kids. But after having seen what a woman goes through during pregnancy, birth, breastfeeding, and child rearing, I would easily say that I would also choose 0, 1, 2, or 3 kids. Certainly not double digits.
One thing that I've heard them say they are unhappy about are the marrying of additional wives. One particular conversation was with two wives of the same man. The older wife said that she did not want her husband to marry, but over time she began to like the younger wife. In the particular case of the gardener, his first wife told him to marry because the first two children were born unhealthy.
I'd say about half the Bedouins I speak to have multiple wives.