It's pretty clear you aren't actually interested in obtaining a balanced view of design flaws in aircraft, rather just trying to win some kind of points. Some

It's pretty clear you aren't actually interested in obtaining a balanced view of design flaws in aircraft, rather just trying to win some kind of points. Some design flaws take time to show up, due to life cycle aging. Most of the rudder issues were in 737-300's, which began full production in the mid-1980s. There isn't just a single "737" model, even for the same 737-XXX series. You can do your own research from here on out. If 6 fatal crashes plus non-fatal incidents due to the same design flaw don't persuade you then perhaps you are not persuadable. The basic fact, that there are plenty of previous cases of serious design flaws in aircraft that became quite safe, is sound, whether you choose to accept that or not.