If we're stringing random facts together to try and make a point, Airbus was found guilty two days ago of manslaughter in the 2009 Air France crash that fell into the ocean.
https://www.bbc.com/news/articles/czd2qmdvmq6o
It's the same airplane as the MRTT, A330.
If you actually read into the case it's more complicated than just it's Airbus fault. It was caused by one of the confused pilots input. Why they were confused is a complicated story.
I think it's fair to call out the parent comment for things that are not exactly caused by Boeing (eg: the engine failure), but I also think it's important to look at the why.
In the case you're referring too, the focus was on poor training and failure to follow up on earlier incidents. It's not the same as designing a system based around a single sensor that is known to fail or forgetting to bolt a door.