What do you mean by "second issue"? A second instance of the same underlying problem, or a different underlying problem? The way you phrase it as unrelated suggests the latter to me.
It's pretty wild to jump straight to "they don't care about safety" here. Building a perfect system without real world testing is impossible, for exactly the same reason it's impossible to write bug-free code on the first try. That's not a suggestion to be lax, just that we need to be realistic about what's achievable if we agree that some form of this technology could be beneficial.
The courts get to decide that. Often it is a "I know it when I see it". The real question is did they do enough to fix all possibly safety issues before this new one happened that was different. If they did "enough" (something I'm not defining!) then they can start over.
It's pretty wild to jump straight to "they don't care about safety" here. Building a perfect system without real world testing is impossible, for exactly the same reason it's impossible to write bug-free code on the first try. That's not a suggestion to be lax, just that we need to be realistic about what's achievable if we agree that some form of this technology could be beneficial.