Legitimizing wifebeating is a red flag of evil values. You are also not directly affected by a pedophile, so would you be "ok" being in business with someone who assures you he only molest members of his own family?
I don't legitimize it. This is not my point.
But were to draw the line to whom to sell. I need to sell or I have no income. It is not about private relations. There is another line. A much more stricter.
I like it systematically even morally.
If I would not sell to the wife beater, I would not sell to the adulterer, to the scoffer, ...
I think there is even another angle to look at it. If you are as a woman a member of this group, you know certainly about the rules there. In Europe and United States everybody can leave. Simply call the police and tell my husband is beating me. Most of them will not and they have even a strong Muslim identity. What can I do about it? And if I sell some rags to the husband at least she and the children have something to wear.
I have so much to do with my own challenges. And I have limited resources. So first God, then my family and me, then the brethren and friends and then after a long distance the rest.