That makes no sense, as I said in Europe marriage rates are falling people are generally marrying less. Also your argument can be used against LBGT people as men turning into women is reducing men numbers for marriage or gay men not wanting women is also taking men away from women to marry, that is destructive the evidence is in the decline of European birth rates but its all legal in Europe. Also shouldn't adults be allowed to make their choice who they want to be with whether in monogamous or polygamous relations?Polygamy is destructive to the family system as this leaves many without opportunity to marry.
There are many things which are not considered normal, without being illegal.
There is literally no valid argument for why polygamy is not legal in the western world only subjective whims and desires, the real facts go against the mainstream narrative.
Anyone believing that children born out of marriage should be mistreated should reconsider that behind bars.
No child should ofcourse but reality is different and there are no laws to stop society to say what they want.....if there was wouldn't it curb freedom of expression?