Yeah which is bullshit. He may not have been paid to make Bash but you can definitely make the argument that there is an ethical responsibility not to foist shit software on the world.

I mean you can't totally avoid Bash today, and that has a cost to society (because it's so shit) which he at least has some responsibility for.

Of course if he doesn't want to work on it and fix things that is fine. But I don't think he is responsibility-free.

Look at it another way - if I build a dangerous bridge over a river, and someone dies crossing it can I say "well you were free to walk around the river"? Of course I can, but that ignores the fact that I made the bridge available to other people, expecting them to use it and importantly it put other people off making a safe bridge. I am in some way responsible even though I only provided something for free that nobody had to use.