Why so much undeleted posts?

[Spacebeans]

http://www.java-gaming.org/index.php?topic=30487.0
http://www.java-gaming.org/index.php?topic=31775.0
http://www.java-gaming.org/index.php?topic=26994.0

There’s more, but some of them are from early 2012. Is there any real way to delete posts?