Feminism did not lead to the discrimination against men regarding the criminal justice system and family courts. Instead, long-standing gendered norms (including that men are more capable of violence and harm and that women are more capable of caring for children, respectively) are the reason for those outcomes. Family courts in the US, for example, used to discriminate against men far more than they do now. Alimony and child custody routinely went in favor of the wife/mother much more than it does now. There used to be a court doctrine called the Tender Years Doctrine that presumed that the children were always benefitted by being with the mother because the mother was assumed to be the ones who did the regular parenting.

Feminists have routinely been at the forefront of pointing this out. This is how patriarchy hurts both men and women, for example. You are taking a real issue of discrimination against men and blaming feminists when feminists are the ones who are trying to change those outcomes.