We’ve been lead into a political world that’s on its way to becoming a two-party system; we feel obligated to vote for one party because they provide the strongest opposition to the terrifying second party. Rather than a more sensible proportionate representation system, UK voters are instead thrown into an all or nothing situation and are faced with this unnecessary voting pressure.
So, whilst I believe that having a decent Green presence in Parliament would only be a good thing, the risk is that they would just be a smatter, drowned out by a Conservative majority. And that is just too great a risk.