I wonder just how many here have ever spoken one-to -one to their MP and expressed their personal view about how they want their representative to represent them. Very few I suspect. So don't blame 'them' for not doing what we want, blame 'us'
(I say this as I am 'involved in mankind' although I have no say in UK, I just pay most of my tax there. I do speak quite often to my local Councillor in Spain)