[Timwi]

I would consider a world in which loonies have a couple insignificant seats in parliament to be a more democratic system than one that shuts them out.

[pousada]

It doesn’t shut them out though, they can still effect change on smaller scale - for example smaller regional and state governments. They don’t need to sit in the nation wide parliament and add noise. The rule also encourages cooperation and compromise which is arguably also more democratic than everyone staying in their more extreme position