I think that would be one of the consequences for anyone who is caught up in or knows about polygamous situations. They may well either be caught up and therefore face deportation themselves, or it may be that they are worried about other members of the family being deported.
So, yes, it's a big problem that we have already, for example, concerning those who have domestic violence problems in this country and don't have secure immigration status. It may be themself or someone else within the family who is insecure, including the perpetrator. Now they may feel that they can't go forward and report domestic violence because they may be removed or someone else in the family, even the perpetrator, may be removed.
Remember that these people often are part of extended families. If you get someone removed from the U.K., it has an impact on you. The whole community or the family have stigmatized women who have gone against and challenged their husbands. It's culturally not acceptable to separate from your husband in the first place. There are a number of reasons why women won't come forward. One of the main reasons we find among women without secure immigration status in this country is the fear of being deported and removed from the country. That is a major reason that they don't come forward.