the love of single ideas that explain everything, one of humanity’s most common cognitive errorsKim Stanley Robinson, the Ministry for the Future
Have a look at its bits: mono from Greek μόνος monos ‘alone, single’, taxo from Greek τάξις taxis ‘order’, philia from Greek φιλία filia ‘love’, but causo from Latin causa ‘cause, reason’. These are all parts of the lexical Lego bucket, but from two different sets that have been combined. It just happens that the Greek equivalent of causa, αἰτία aitia, is not much used in modern scientific neologism.sesquiotic.com
The word was apparently invented by Ernst Pöppel (humor?) I did a search through the history of the wiki page that Sesquiotic mentions as showing up in a Google search. There is no record of the word ever being part of the page. The edits on wiki articles are preserved (in a general sense. Wiki-social does this as well) so the word probably never appeared on the page. why the wiki page shows up when you do a search for Monocausotaxophilia is a question that Google will have to answer.