The common wisdom of the community is that WP:You are not irreplaceable and that everything will get done just as well if individual contributors leave or are banned. This wisdom is, in my experience, wrong and dangerous.

Consider what were to happen if I (User:Pppery) were to stop editing Wikipedia, either of my own volition or if I were to get desysopped and banned:

Every regular editor's activities have this iceberg structure, where some of what they do is working toward a common and well-staffed pool, and various other parts are obscure and unwanted personal itches, and various parts are obscure but wanted thankless tasks that nobody else happens to have the knowledge and ability to do.

And you often don't know what that last bullet point of the iceberg for another editor is. From my experience as an onlooker or occasional participant, when the community moves for a regular editor to be banned, or for an active admin to be desysopped for what seems to me like relatively minor misconduct, they don't seem to realize this, and how they will often unwittingly cause important neglected tasks to be undone.