I used to think that. They say they are against it. When given an opportunity to actually fight it in the past they rolled over and did very little (essentially asking for minor tweaks).

Liberal Democrats are bench warmers and when they are moved into play they can't execute anything - for example their drugs minister Norman Baker did nothing along the lines what Liberal Democrats preach. They are a political laughing stock and nobody takes them seriously.

They didn't exactly cover themselves in glory during the coalition.

As a side comment, did you know Hillary Clinton we getting leaks from behind the scenes at the coalition negotiations (see the PDFs)

https://wikileaks.org/clinton-emails/emailid/2850

https://wikileaks.org/clinton-emails/emailid/2817

and some other interesting stuff

https://wikileaks.org/clinton-emails/emailid/6988

https://wikileaks.org/clinton-emails/emailid/7377

The SNP are the third biggest UK party.