The problem isn't that we fail to apply the same rules for software development in safety-critical and non-safety-critical contexts. The problem is that we do apply the same software in both contexts.
Gatekeeping the entire industry isn't the answer unless you want to cripple it... but if someone wanted to issue regulations along the lines of "Don't steer your nuclear-powered aircraft carrier with a Windows app," I wouldn't object to that.
Engineering standards are built on piles of corpses. We’re lucky that most of the growth of our industry has been in non-life-critical areas.
But regulation and standards are coming eventually - shoddy code will just have to kill a few thousand people first.