This explanation of the potato plant fire almost makes sense until you get to where it started at 2 am with only the 8-person (likely illegal) cleaning crew was there: https://www.potatogrower.com/2022/04/cause-of-maine-processing-plant
Still, it is hard to get a baseline on how many fires, etc., take place across all our food-related facilities every year.
I have read that fires at food plants are generally very uncommon. So this looks like a deliberate campaign.