There are many pages in Wikipedia where discussions take place. Article and User Talk pages are primary examples but there are other locations too: Articles for deletion, Deletion Review, and Requests for adminship to name just a few.

Through the course of these discussions, editors learn new information and can gain insight to an argument or position that they had not considered.

In other words, editors can change their minds.

If an editor changes their mind, don't hold it against them. One of the primary purposes of having such discussions is to work to build consensus. If an editor changes his or her mind, it simply means the process is working.

Editors are free to change their minds or not change their minds as they see fit.