Nowadays there are so many Christians that are aggressive to anyone with a different opinion, and they're making so much damage!
We should reach other people trough love.
Most Christians are not involved in missions.
Because these kind of issues are only dealt with on a theoretical level it is easy to criticise and condemn because real people are never directly affected.
However, in time past in parts of Africa, Asia, and Oceania Christians forced women living in polygamous relationships to leave their husbands. The result was that these women, and their offspring in many cases, became outcasts shunned by all.
The whole society was affected.
The deleterious affects of this and other really stupid interventions have blighted Christian witness in these places to this day!
So, yes, polygamy is far from God's ideal.
How we, as Christians deal with the issue, also says a lot about how close we are to God's ideal...