Thing with PR is for it to really work properly and for it to be truly democratic, then people have to accept that there will be extreme views represented in government/parliament and that is right, given they also exist in the populace.
In a mature democracy, I’d argue that’s a very good thing though. Majority rule means the policies they’d be advocating would never get enough support to be implemented and having their ideas properly platformed and scrutinised has as much if not more chance of dissipating their support rather than increasing it.
Getting a parliament truly representative of the populace as a whole is a fundamental tenet of pr and proper democracy in action, no matter what the views are.
And yes to scrapping or at the very least overhauling the House of Lords.