@dotcolm @mayaisloading This is entirely true, and exactly what my parents told me when I came out to them. Better to get married and be self hating than to be gay, even if I'm unhappy. It's more important (their words).
I think a reasonable portion of it is also that 'just one drop' mentality, and pretty much every person has been attracted to someone outside of their preferred specs at some point. Most of us shrug and say 'huh', some say 'well, maybe I'll change my looking for settings'.
@dotcolm It happened. It's decades past, and I won't say it doesn't occasionally crop up in my interactions with them (it's certainly not something that 'goes away', especially when they never got around to saying they're sorry about what they said to their 20-something son), but honestly there are worse things.
We have a fairly civil interaction basis now.