Only because their supporters are childish and irrational. I'm sure some Conservative voters didn't think they'd be voting in the LDs, but they weren't punished for it. As I say, Clegg took a wasted vote, a lack of voice, and turned it into something for their supporters.
Or perhaps getting nothing was better. The loss of support meant our local LD MP, a scientist who was a very intelligent and well thought of MP, has been replaced with a businessman from Labour.
Seeing the way many on the left carry on now with the bile makes me ashamed for them, it's embarassing, I support the Conservatives at the moment at least in part because I can't stand to be associated with leftist party supporters anymore, but also because none of them even have credible policies at the moment.
I think the sole thing in recent weeks which really illustrates it best is this:
http://www.theguardian.com/politics/2016/jul/31/how-did-the-language-of-politics-get-so-toxic
The Guardian for those unaware, is the ultimate embodiment of the 'liberal elite' in the UK. I agree with the headline, I'd pay £100 to never have to read someone describing their opponents as "vile" for a whole year. However....
Of course they removed it from the Guardian shop as soon as someone called them out for this hypocritical bullshit a few days ago, but it's still there in the google cache for all to see.