You have to decrease their numbers before they start getting uppity thinking they can conquer the kingdom of god.
When it's plural as in "lice" it's an obvious problem to be eradicated.
But why in the singular form of "louse" do I suddenly imagine a Fantastic Mr. Fox character? A little guy holding a tiny briefcase waiting for the bus in Louse Land.
It should be the opposite, because looking at lots of them is like "Ahh rolly pollies! Cool!"
But if you zoom in on one's face... you notice some ancient trilobyte Alien 3 finger fangs rapidly shoving microbes into its pie hole, who knows what kind of monster this thing is to all the hapless beings down on its level.
The spider doesn't care about any of this shit, he's just like: "Not in my house, louse." before spinning him up in his butt threads and draining his blood like a literal vampire.
Nature is awesome.
There was an old lady who swallowed a cow; I don't know how she swallowed a cow! She swallowed the cow to catch the goat, She swallowed the goat to catch the dog, She swallowed the dog to catch the cat, She swallowed the cat to catch the bird, She swallowed the bird to catch the spider That wriggled and jiggled and tickled inside her, She swallowed the spider to catch the roly-poly; I don't know why she swallowed a roly-poly – perhaps she'll die!
Unfortunately, I quickly got disgusted (because I'm a wimp when it comes to insects) and retreated back into the house. But I haven't been able to get this image out of my head for a year. And since you commented about the god of rolly pollies, I finally had the chance to share it. I wish i had taken a photo of it.
P.S: while googling to check if rolly polly is the correct translation to my native tongue, i found out that they're not even insects but crustaceans.