Als Gregor Samsa eines Morgens aus unruhigen Träumen erwachte,
fand er sich in seinem Bett zu einem ungeheuren Ungeziefer verwandelt.
The word vermin is an ugly term for an ugly phenomenon; a qualitative noun that doesn't innocently describe a type of unclean animal or a class of sub-human subject, but identifies, classifies, and characterizes as such.
A morally pernicious term that is effectively a mortal judgement passed; a death sentence. For to designate as vermin is to make fit for extermination.
It includes wild birds and beasts that are thought to carry disease or in some other way endanger or threaten to disrupt human enterprise with their destructive activities; pesky insects and parasites that swarm and infest; and, lastly, people perceived as dirty, despicable, and problematic (Jews, gypsies, immigrants, the homeless, the unemployed, and the poor in general).
Thus, if when applied to animals the term betrays mankind's innate sense of supremacy or speciesism, when applied to our fellow men and women it manifests our murderous racism and xenophobia.
The Nazis, of course, had a particular penchant for portraying their opponents and those they feared and despised as Ungeziefer and Untermenschen - i.e. not worthy of sacrifice or society; Lebensunwertes Leben.
And so vermin is a word that makes me particularly uncomfortable; one that I would never use and do not like to hear used. It reminds me at last of poor Gregor Samsa; what happened to him might happen to any of us, so there's surely a lesson to be learned here.