It's similar to the situation with companies like Google blocking people who have no easy way to get support, except more morbid.
I'm not fond of living in such a world where personal responsibility is dissolved and becomes meaningless.
This is something that I really don't like about our society, the fact that someone "must" take be responsible. When someone goes on a shooting spree, of course they should go to jail. But if they die in the process of committing their crime, there is almost always an outcry for the next person in line to be responsible.
We have rules about motor vehicle operation. The operator is responsible. If you are the passenger in the back seat of a cab, the driver is responsible, not the passenger. If there is nobody else and you are the pilot of an autonomous vehicle, you have to assume responsibility for your vehicle and its actions.
If you bought a faulty gun with a broken safety catch, and waved it around in a crowded street, and it fired, killing someone, you should be held personally liable. You brought the gun out in public and created the scenario which caused someone to be hurt by it.
Looking at the fuel line question through that lens: did the leak start while you were driving and you were completely unaware? Or has it been leaking for a while and you just haven't gotten around to fixing it.
With the ammunition, how was it stored? Was it dumped in a toolbox filled with pointy screws? (A reasonably prudent person ought to know that ammunition is fired by striking the primer with a sharp object). Was it stored in the front seat of the car on the hottest day of summer? (A reasonably prudent person would expect it to get really hot in there)
Etc. Etc. The thing about negligence is that there's a lot of room for interpretation. As another example, if you've been driving a car around with self-driving features, and you've experienced it behaving erratically multiple times, and that's followed by an accident... you knew or ought to have known that it was dangerous to be on the road in that vehicle. If there was an OTA update for the autopilot last night that installed silently, and it results in a crash, then it's probably the manufacturer who's liable.
Volvo's acceptance of liability seems little more than a smart business decision- the cost of an insurance payout to the family of the deceased is less than the money they stand to earn in profit from selling autonomous vehicles. We can't allow this generous actuarial calculation to absolve the operator of such a vehicle of responsibility too. If you don't like it, take the train.