Since when did they actually care? You act as if everything they say is 100% honest when, in reality, they often just say the opposite of how they feel. If they gave a shit about girls getting raped, then they would do the following:
1) Heavily clamp down on illegal immigration. Nothing makes sex trafficking of girls - including children in general - easier than illegal immigration. If a child "doesn't exist" as far as local, state, and federal governments are concerned, then there's no missing person report given and no knowledge as to what happens to that kid. Leftists know full well that many, if not most, illegal immigrant children are pimped out and often killed, dissolved in lye, and forgotten about.
2) They'd make sure abortion clinics have to retain DNA evidence of their victims. Those places know that most young girls who go there - or, more accurately, are forced to go there - are victims of rape and trafficking. However, those places make money from child rapists and sex traffickers and thus never want a pedophile or trafficker behind bars.