When people talk about how progressive
Star Trek was, they always mention stuff like the kiss in
Plato's Stepchildren, or the not so subtle "racism is bad" of
Let That Be Your Last Battlefield, but this one often gets left out even though it is openly talking about birth control, which is weirdly still a taboo for some people, and then there's also...
"Yet you can kill a young girl."
I very much doubt this was
actually intended, but if you take that conversation between Krik and Hodin out of context, Kirk is essentially arguing pro-choice there. That short exchange highlights the hypocrisy of protecting life from conception, when young women are forced to die as a result, here because of a "lack of space", but in the real world from the lack of availability of legal and safe abortion.
Again, I don't think this was
consciously written in, indeed it does seem like just a side effect of a poorly thought out take on the dangers of overpopulation, but it
is a possible reading of material, and for all the flak I've given
Star Trek for being inadvertently sexist, I feel it needs to be mentioned when it's inadvertently pro women's rights as well.
On a little less serious note, I'm headcanoning that this is actually a prequel to
Logan's Run, for a while the kids on Gideon were volunteering to die, and then at some point it becomes
mandatory...
Also, Kirk apparently had a case of the Vegans, but got better. So eat your meats kids!