I think there's something symbolically interesting about the Young Men's Christian Association taking a field trip to Planned Parenthood. Good for them!
As for "equal time," I'm sure that the students got exposure to many interesting and complicated ideas: women's health care as a priority, the importance of reproductive freedom, strategies for conducting protests, the oversimplified framing of a complicated issue ... That's much more valuable educationally than just getting two views on a controversial question in a classroom.
...because public space really matters!
Elizabeth