It is mentioned in the guri-pf that a lot of their members come from Caldari Navy and from the disenfranchised of the State. Such as the gay population - see such officers as Kaikka Peunato. Being gay is not ok in the State even if the player base conveniently like to ignore it for their purposes. Unless they have changed this again recently, you can find this in Kaikka's in-game bio.
It is slightly off-piste and I voluntarily poke my head over the parapet, but I have always wondered about this. I assume current RL sensitivities take precidence over the PF in this case which I find at least a little disappointing. It certainly adds further avenues for conflict which would spur more things on; In game conflicts, RP, all sorts.
ninja Edit: It goes way back to post collapse days when everything on Caldari Prime was geared towards survival. While not entirely relevant to modern society, the Caldari are well noted traditionalists. I don't , personally, see them disregarding this part (or any part) of their history so light-heartedly. It is a small part of what makes them who they are, as a people.
I've always viewed this as having to do with the trifecta: Caldari spiritualism (ancestry), State militarism, and the State's well-known history of population problems (tube children).
But, as with almost every heteronormative society in the history of ever, it seems logical that there would be significant portions of the population that don't really care about it. Practical bloc, especially with their lack of moralistic tendencies, has always seemed the most likely to not care.
That being said, if the society is homophobic to the point of someone getting removed from the CN, it is likely that those who tolerate it wouldn't be particularly vocal about it. On the other hand, militaries are often the last part of a culture to change on this topic. It is possible that CN acts in such a way that is a remnant of eras past, beyond what the rest of the State perceives. Most RPers that even pay attention to this part of the PF treat it as "Don't Ask Don't Tell" on a whole societal level.
As can be seen by the hemming and hawing this issue causes, we really need more PF about it State moral values.