I wonder if there is a compromise that can be developed.
I agree that deleting nodes = bad thing...but
How about the ability to do something similar to Reaping or in this case, Self Reaping?
Perhaps a user, within certain guidelines, could "reap" their own node and the result would display something like "phydeauxarff has reconsidered this node for presentation - for more info click here" and provide a link to the original node should anyone care to dig in and see what it was
this would offer folks a chance to recant something they decided they didn't want to say after all and would still keep the continuity of the site intact