My favorite was when the behavior of a USB drive in /etc/fstab
went from "hmm it's not plugged in at boot, I'll let the user know" to "not plugged in? Abort! Abort! We can't boot!"
This change over previous init behavior was especially fun on headless machines...
Same argument against vegetarianism/veganism
we have teeth "designed" or evolved for eating meat, thus we should eat meat.
...we also have brains capable of abstract reasoning, but nevermind that!