Seriously though, if they have some sort of religious or cultural ceremony to cement these marriages, and if the marriage units tend to be stable, save for the addition of more wives, it's probalby a better environment for raising kids than marry-divorce-remarry serial polyamy increasingly practiced by more mainstream folks.
YOu can't judge a whole group by one nutjob.
I think that considering the very high rate of public assistance we should not be bringing more in. I understands using immigration to gain skills in short supply, but I thing we already have a surplus of skilled welfare recipients.