Perhaps they're simply not inclined to argue with you given your penchant to dismiss established information as "that's not realistic" in an attempt to damage others' arguments.
There's little point to trying to have a discussion with someone when they respond by plugging their ears.
I dismiss established information as not realistic because it is NOT realistic.
And I dismiss it as immoral because - guess what - according to all real cultures that created and maintained a wealthy, technological civilization, it IS immoral - as I have shown (you being the one with the habit of plugging your ears).
But - fine.
Let me reformulate:
If you have no counter-arguments - beyond fictional klingon "culture" fan-boyism -, you should at least have the courage of saying so instead of hiding behind baseless dictates.