Should Apple or Samsung be held liable for making the phone that the plaintiff probably used to use these apps? How much responsibility do they bear?
Further, Facebook/Instagram and YouTube are free products from the perspective of the plaintiff. These corporations didn’t sell anything to the plaintiff, so can they even be held liable? They did sell the plaintiff’s data to advertisers, which I think you might be able to hold them responsible if they misused that data, but this isn’t what the case was about.
I’m not rooting for depression or suicidal thoughts or anything, but this doesn’t feel like the right direction we need to be moving in as society. We can’t simultaneously argue for free speech and freedom of choice and also claim that we aren’t capable of making our own choices to live our lives responsibly.
Some of your examples are not very compelling.
In the case of Remington, there was another party that (presumably) the jury found was more directly responsible. Also, the victims of sandy hook were not Remingtons' customers.
Apple does not make you install instagram on your phone. And I doubt that you could find really compelling evidence that Apple knew in great detail the harms that were being caused, and rather then seek to mitigate them, instead made them worse in order to earn more money.
I'm not sure there a requirement that a product be paid for in order to be subject to product liability law.
I think I agree that these product liability cases are not the best way for a society to deal with these problems. I would prefer to see the democratic process arrive at some reasonable solution, based on the desires of the majority of the population. But there has been almost no movement in that direction, and I have my doubts there will be (in the US).
And I think it's important to see that this is about 16 (and younger) year old children, not adults.