Vogons are perfectly capable of corrupting Nature without the help of humans. And even restoring Nature by wiping out humans to make way for a hyperspace bypass.

At least he didn't say it was bad as Paula Nancy Millstone Jennings's poetry about decaying swans.

http://www.bbc.co.uk/cult/hitchhikers/guide/poetry.shtml

https://www.youtube.com/watch?v=IxPeIiU2kx4

Or the Electronic Bard's horrible poems:

http://www.art.net/~hopkins/Don/lem/HorriblePoems.html

Despair not, never give up, and just keep practicing: there's always room for improvement:

http://www.art.net/~hopkins/Don/lem/WonderfulPoems.html