They are two sides of a
potentially very dangerous psychological coin, if the implications are considered literally...and considering things literally is what fundamentalists of the religious and scientific stripes specialize in.
Quick, Angela, gimme some context for "Some propositions are so dangerous that it may even be ethical to kill people for believing them" !
Edit: I'm a Christian, and I'll give you some context for killing your child if he talks back: tribal religions exhibit barbaric traits; more evolved forms of the tribal religions self-correct over time. Christian ministers vigorously defended slavery from the Scriptures in the 19th century, but they mostly don't do that anymore. The Reconstructionists...they're another story....
How are we to escape a New Edition of the Spanish Inquisition, or alternatively, The Reign of Terror?
That may not be as off-topic as it sounds, as polarized as the creation-evolution debate has become.
"Kill the dangerous people" functions equally well as a religious or secular meme, I must point out.