Asbestos is especially tricky because there is one uncurable and terrible cancer that it is the only known cause of--although we are reasonably certain it isn't the only cause, it's the only known cause. That has been a boon to the mass tort lawyers in a way that no other substance (that I'm aware of) has benefited them. Also tricky because there is asbestos in the ambient air in a lot of places that has nothing to do with industrial asbestos exposure. It's a natural substance that is out there in the air we breath, even if we've never been near an asbestos-related product.
(To be fair to the zealots, we have probably all been near an asbestos-related product at some point--but the stuff is only dangerous if friable, and the amount of friable asbestos in the modern U.S. from asbestos-related products is pretty low.)