Do you mean anything with a 50% or above acceptance rate is unacceptable?
If so, this is HIGHLY flawed thinking. Acceptance rate tells you one and only one thing, how popular a school is in the minds of the current applicant pool. It’s a self reinforcing metric. Students and families wrongly assume that if it’s hard to get in it must be good. Caveat Emptor is all I can say to that. Some of the highest ranked, lowest acceptance rate schools in the nation have giant classes, heavy reliance on TAs and generally poorly regarded undergraduate teaching. Some great schools let more than 50% in.
I know nothing about PoliSci/IR, but if journalism is your goal, you could do worse for a safety than the University of Missouri. They were the first J School in the nation and still well regarded. You’d get in and you’d likely get good money.