Earlier quoted context omitted.
Why on Earth would the user be expected to implement a fix for a problem they didn't cause themselves in the first place?
Why the Earth should the user not want to implement a fix/workaround/whatever for a problem they didn't cause themselves but can trivially solve?
Clicking "back", noticing that the site broke it, moving the mouse and long-pressing "back" (I normally navigate with a mouse thumb button or a trackpad gesture) is much more annoying than my browser just preventing this from happening in the first place.