It's far from a comprehensive list. Many of the causes are listed as "unknown" as well. This page lists 9 unintentional collision events: https://en.m.wikipedia

It's far from a comprehensive list. Many of the causes are listed as "unknown" as well. This page lists 9 unintentional collision events: https://en.m.wikipedia.org/wiki/Satellite_collision https://en.m.wikipedia.org/wiki/Satellite_collision and it's clearly not comprehensive either since it doesn't contain some from the other list. And collisions are not the only kind of accident creating debris clouds. The page cites 250 debris creation events as of 2015, there have been more since, and most of them were not intentional. Ultimately it doesn't matter what specific kind of unintentional accident created debris. All that matters is how long it will pollute orbit.