That's like going bungie jumping...
... and then suing the bungie jumping company for tying an elastic rope on you and throwing you of a bridge.
Everybody knew that such software is highly problematic. It's simply not a good idea to try to fix the problem of to much software by adding more software... particularly if that software is written by people who are not security minded.
I can understand private people being fooled by companies like this, but we are talking about a large company... with legal departments. Why didn't the legal department find the clauses that said that the software must not be used for critical applications? Why didn't any of the technical departments object to that sort of software? Why wasn't anything done when the Linux version of that software had, essentially, the same bug... some weeks before this?