Due to security reasons on most browsers, pages are not allowed to redirect or have links to about: system pages. Some, like about:quit, about:hang, or about:restart (all found at, in chrome's case, chrome://chrome-urls/) do unwanted things to the system.
If redirects and links were allowed, people could exploit clickjacking to restart people's computers, hang them, and more. However, it seems that about:pages themselves are allowed to redirect to other pages, like on the about:chrome-urls page.