States attempt to hold a company accountable for giving its citizens cancer.
Not like that the conservative Supreme Court says.
Either the conservative movement lacks internally consistency, or it is quite consistent but around one central idea, corporations (that are willing to bend the knee to the government, see anthropic for a cautionary counter example) should be unrestrained from seeking profit.
Even the original states rights arguments around slavery were about how private enterprise shouldn’t be restrained from utilizing chattel slavery to extract profits. Seen through that lens the ruling makes perfect sense, if deferring to a big federal rule is best to protect profits, then big government. If deferring to states causes a race to the bottom ensuring profits, then states rights it is.
I seriously suspect that glyphosate's safety is so obvious at a population level compared to what's in roundup now, folks in power aligned who didn't want the market for other herbicides to get restricted.