There's a few reasons, depending. Some of them are nutball religious types who take be fruitful and multiply seriously, so they shit babies by the bucketful. They also tend to be concerned with tradition and lineage, so they want to continue their family line or whatever. Also they view women as baby makers (and women view themselves as baby makers too) so they just do that shit like it's their fucking job.
There's a few reasons, depending. Some of them are nutball religious types who take be fruitful and multiply seriously, so they shit babies by the bucketful. They also tend to be concerned with tradition and lineage, so they want to continue their family line or whatever. Also they view women as baby makers (and women view themselves as baby makers too) so they just do that shit like it's their fucking job.
also they associate having many children with male virility and therefore manhood or some shit