Making red (dead) links to make a point is not allowed. A user found doing so will be warned and then blocked if they continue making them. Red links should only be created when they actually lead to pages that need to be created, such as in navboxes. Users should not delete red links of this type.
If a talk page or otherwise old discussions page has redlinks, deadlinks or broken file images due to the age of the post, they can be changed to remove the broken links. This decreases the amount of broken links that appear in insights and other backend notices.