And you mine, my friend. And you mine.
Had the Tories not run such a diabolically awful campaign with such a dismal leader, your party would have been slaughtered. Because not enough people think that the ideals you support are what they want or what we need. It's as simple as that. Most Labour MP's get this, which is why Corbyn has been so terribly unpopular in his own parliamentary party. Doubtless they will be surprised that he did better than expected, but you still lost against a shockingly bad Tory party after 6 years of austerity. If Corbyn cannot win in that environment, he's peddling the wrong stuff.
The sooner you and people like you start to get your head around that, the sooner you'll have a chance of actually running the country.