So why didn't they pass any laws then?
In 1919 there wasn't even a fully unified Polish national law yet. Poland regained independence in November 1918 (only a couple of months earlier) after 123 years of partitions. Obviously, a whole lot of other specific laws weren't in place back then either but it doesn't mean that human trafficking was an issue "ignored by men".
Prostitution of underage girls, for example, was apparently common and pretty normalised during the interwar period in Poland.
Also, illegal abortion was a plague - some sources estimate 4 million in the whole Poland in the interwar period...
ciekawostkihistoryczne.pl/2015/10/13/cztery-miliony-skrobanek-cala-prawda-o-aborcji-w-przedwojennej-polsce/
I remember reading somewhere that there were certain circles within the Catholic Church in Poland that inrepreted the WW2 and horrible nazi occupation as God's punishment for the widespread sin of murdering unborn babies. As you can imagine it wasn't a very popular theory among Polish Catholics in general.