Problem was the only stable government that could have happened at the time was Conservative leading with LD following. The only other combination that could have worked would have been Labour/LD/Extremely hated at the time south of the border SNP and a few others. It simply put wouldn't have worked especially since Gordon Brown at the time was hated.
LD could only been there basically be there to basically pull back the worst of the Tory shit. Which we have seen since they were punished by the electorate is that the Tories when left to run as a majority of their own are absolutely psychotic. Sad thing is that it seems many LD voters ended up punishing LD by voting Conservative for some reason or voting Labour in a place Labour never had a chance.
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Seems to be an issue not just here but elsewhere. The right seems to be unified while the left seems to be stumbling over each other saying "They're not left enough so they're really rightists neo libz." or some shit like that by the far left and the centre left pointing out the far left isn't as electable and some even would rather vote centre right than far left.