There are perfectly good laws against all the crimes your ignorance conjures up regarding polygamy. Use them. The crime you keep fantasizing about is not polygamy, it is child abuse.<quoted text>Is it isolated? Frank, you might want to look deeper into it. There are many countries around the globe, where polygamy is promoted. You might want to dig a bit deeper.
If some people in same sex marriages commit crimes do you advocate banning same sex marriage too?