The problem with PR is that it appeals to people's ill thought out ideas of who it might be nice to throw a vote to here and there and then we end up with the cünts in Parliament, fücking things up.
So, for instance, your mum (or similar) might vote for her first choice party based on some hard reasons and then chuck a sympathy vote at - for instance - the Greens on the grounds that she thinks it's probably nice to look after the planet and...y'know...recycling and trees and stuff.
Then, before you know it, we end up with these hemp-clad lunatics hanging around in Parliament wielding actual power with their absurd, luddite ideas. AND PEOPLE WILL END UP HAVING TO PANDER TO THEM IN ORDER TO GET ANYTHING DONE!
Before you know it, meat-free Monday is a statutory requirement and Foie Gras is illegal. And all because some voters didn't really think about it that much.
No, I'll stick to FPTP, thanks. It concentrates the voter's mind and keeps utter spastics out of power where they belong.