I was reading at a website and when I got to this part I decided to post it here on the Walter martin Forum because it so clearly sums up my own views too.
I took the following quote from -
http://americablog.com/2014/11/the-m...-polygamy.html
"
So we are left with three possible explanations for why Joseph Smith established polygamy as a principle of the Mormon faith.
The one being offered to us by the Church (an angel made him do it).
The one suggested by the repe***ion of history (young religions — including Judaism and Islam — often adopt polygamy as part of the larger goal: sustainability and growth).
And the one suggested by the biography of the religion’s founder (Joseph Smith was a horny con man). "