Saying the suffering is the point gives them far too much credit I think. They lack the fundamental capability to understand the impacts of their decisions and position. They can’t go past the basic and horrifically oversimplified “murder is wrong”. They won’t entertain situations in which the life of the woman could come into play. They can’t fathom why anyone might not consider a fetus a person. They legitimately don’t understand that they could be wrong. So how on earth could they be wrong?
They cannot process the full depth of the situation. So they revert to the simplest interpretation they can manage.