They're not. A lot of colony insects do, but most predatory insects aren't.

[Praying mantises, assassin bugs, bombadier beetles, etc.]

Are you talking about a worm worm, a person controlled by a worm, or a worm that's shaped like a person?

[Because if the latter, why are they called "worms" in the first place? As for people-shaped kaiju-]

We take them out like any other monster.

[Especially if they're killing other people. Jack and the Beanstalk, right?]

Aa. I'll be able to fight the next kaiju properly.

[Well, his arm will remain out of commission, but he's not sitting on the sidelines.]