Pulling real-world data into this debate opens them up to the argument that there are no female space marines because there are no space marines. Space is inhos

Pulling real-world data into this debate opens them up to the argument that there are no female space marines because there are no space marines. Space is inhospitable and marines would not be effective. And that would remind most people that this is pretty low-stakes decision about changing up a fictional setting. The real worry is about messing up real-world friendships made around it, and I think those will survive ok. Growing a community means not giving the loudest whiners a veto.