So we are all on the same page here, with all my Hondaswap legal team, you all understand that if you slip and fall on a person's property - their general liability policy covers the claim, if you were to file one, correct? You would still be found liable if that person was wearing too high of heels, slipped on ice, was too drunk, or if they broke into your property and drowned in your pool.
There is something called absolute liability. You do not have to be negligent to be found liable. Two entirely different concepts.
To answer whoever asked the question about aren't these other parties liable? The answer is maybe. Depending on the circumstances and case law in your state, they may be liable.
It's a different answer to a question that was not asked but yes, those other parties will be sued as well. Any lawyer worth half a shit is going to file a suit against the factory, the school, and whoever else they can name in a lawsuit. If the school is privately held, the owners of the school will also be named in the lawsuit. The goal is to pull money from all of then personally or more realistically through their insurance policies.
I am dealing with a claim right now where someone dropped their car off for service, signed a loaner car agreement that their insurance would be primary and that they wouldn't text and drive or be inebriated. Guy went to the bar, got drunk, hit and killed an off duty police officer. We reserved the claim at $500k - thinking we may be on the hook for up to $500k because NJ typically makes insurance companies share the claim on a pro rata basis. It's now three years later and the criminal trial isn't complete yet. Until that is completed, we can't dispose the person and motion for a summary judgement. Meanwhile it has cost this auto dealer tens of thousands of dollars in increased insurance premiums for the last three years. (Premiums are partially calculated based off of paid and reserved losses).