My advice for the one node: In future, if you have a node posted to the wrong thread, then add a paragraph to the node saying where the node should be but not deleting the contents and then ask in the chatterbox for someone to move the node or, if no editors are free at the moment, to consider the node to be moved. And be patient.

Read (tye)Re: why a nodelet can be kept against author wish? for more on this type of situation.

About the only nodes I like to delete are duplicates. In the case of a duplicate, prepend "(DUPLICATE)" to the title of the one you want deleted, then have someone consider it with a reason that includes a [id://...] link to the other node.