It's not difficult for me to get the difference: manufacturers' actions can kill thousands of people by subjecting them to additional risk without them knowing.

It's not difficult for me to get the difference: manufacturers' actions can kill thousands of people by subjecting them to additional risk without them knowing. Individuals have a right to subject themselves to risk. The food industry is regulated to avoid food contamination or food poisoning - but there are no laws against eating mouldy food in your fridge if you want to; that is on you. Obviously, if the aftermarket product puts other people at risk, then the consumer who did the modification would be legally liable