It easily goes both ways. But we do sue American gun makers for deaths caused by lunatics. We sue drug makers for drugs prescribed by a doctor. We sue cloud providers for not reporting illegal photos. Printers are forced to id every printed page to combat counterfeiting. Banks are forced to do close accounts even though it's not their dirty money

Most of those examples have to do with the manufacturers knowing that their products were dangerous, addictive or illegal and advertising them aggressively as safe. They're mostly litigated on product liability claims. Banks are regulated by an entire architecture of laws, and we could enact laws that would regulate Flock too, as one of the other commenters pointed out they're doing in Oregon.

> But we do sue American gun makers for deaths caused by lunatics.

No we don't, there's a federal law explicitly protecting gun manufacturers from liability for gun crime. https://en.wikipedia.org/wiki/Protection_of_Lawful_Commerce_...