Inverted logic, deletion is not allowed by default.

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ForumPostPanel.java

@@ -89,7 +89,7 @@ public class ForumPostPanel extends Panel {
     }
 
     protected boolean allowDeletion() {
-        return true;
+        return false;
     }
 
     protected void onPostDeleted() {}

view/src/main/java/se/su/dsv/scipro/forum/panels/threaded/ViewForumThreadPanel.java

@@ -61,6 +61,11 @@ public class ViewForumThreadPanel<A> extends GenericPanel<A> {
                     ListView<ForumPost> listView = this;
                     item.add(
                         new ForumPostPanel(POST, item.getModel()) {
+                            @Override
+                            protected boolean allowDeletion() {
+                                return true;
+                            }
+
                             @Override
                             protected void onPostDeleted() {
                                 // Refresh the list of posts

view/src/main/java/se/su/dsv/scipro/reviewer/timeline/Event.java

@@ -22,13 +22,7 @@ interface Event {
 
         @Override
         public Component component(String id, IModel<Event> model) {
-            return new ForumPostPanel(id, model.map(Message.class::cast).map(m -> m.forumPost)) {
-                @Override
-                protected boolean allowDeletion() {
-                    // Do not allow deleting forum posts in the timeline
-                    return false;
-                }
-            };
+            return new ForumPostPanel(id, model.map(Message.class::cast).map(m -> m.forumPost));
         }
 
         @Override