Everything exists in an economic context. Errors in plumbing, dentistry, and electrical work can result in thousands or hundreds of thousands of dollars in damage, and they often can't roll out a fix in a matter of hours. Some software bugs can also result in lots of damage (financial/health data security, etc), and we do take those bugs seriously via compliance (although compliance isn't a guarantee for good software just like it's not a guarantee for good dentistry). But no one is going to pay for the effort required to perfect every software release, nor should they.