Squirm: Okay, but Why Did The Worms Attack?

Okay, so I finally watched Squirm (1976). I'd heard about it for ages, mostly that it's cheesy and gross, which, yeah, pretty accurate! But what I'm kinda stuck on is... the motivation? Like, I get the freak electrical storm thing, that sets up the whole 'worms gone wild' scenario. But why are they attacking people? It's not like they're starving or anything, right? There's plenty of dirt and decaying stuff around in the Georgia countryside. Was it the electricity itself that made them aggressive, or some kind of mutation that made them actively seek out humans? The movie kinda glosses over that, just showing them swarming and being creepy. I think the scene where Roger is covered by them is scary AF, but I'm still left wondering what it's all about... And another thing - what was with the worm farmer? He seemed like a suspect at first, but then he just kinda... becomes worm chow. Was there supposed to be a deeper layer there that got cut? Maybe I'm overthinking a super-low-budget horror flick, but sometimes these old movies have weird subtexts you only catch years later. Anyone else have thoughts on this? Or maybe I need to rewatch it more closely?