Also, the SNP are just less left-wing than Labour are; at least in terms of policy positions. This is a party which created of a single national police force, with the regular use of armed response units, and put in place a stop and search rate over four times higher than the rest of the United Kingdom, with plans to create an integrated ID database. Even a heyday Blair didn't go that far (admittedly not for lack of effort). This is the party that sucked up to Donald Trump, Brian Souter, and was completely on board with the BSkyB deal because of Murdoch's long-running relationship with Salmond; the party that wanted to lower corporation tax so that businesses in the north of England, a poorer area than Scotland, would relocate to Edinburgh (hardly we're all in it together). They cut welfare and educational provision for the poorest while in office. Salmond floated the idea of
a benefits cap himself, so they're not even different from Harriet Harman in that respect.
The SNP are, policy-wise, almost identical to New Labour and possibly even a smidge more right-wing. Their sole defining "left" policy achievements are retaining tuition fees, a system which redistributes money from those who don't go to university (and thus are likely to be poorer) to those who do go to university (and thus are likely to be richer), and the abolition of NHS prescriptions. England doesn't actually have NHS prescriptions for the poorest anyway because of the Low Income Scheme provisions (although it's inadequate and needs adjustment), so this is another "free stuff for the middle classes" policy, not an actual attempt to improve the plight of the poor.
Labour lost in Scotland because they were seen as incompetent and uninspiring, and because the SNP are damn good at what they do. Salmond and Sturgeon are both incredibly effective politicians and know exactly what to do to sell a story. It also helps that they're supported the entire way by Murdoch's empire and various other business papers that support their economic slant comparative to Labour. They're just a different flavour of Blair and Mandelson and the era when Labour had the support of the press, rather than the Miliband era where he was vilified. Ed Miliband was the most leftwing leader Labour has had since Foot - you have to remember Kinnock was the man behind the original prawn cocktail offensive and did a great deal of work in establishing the basis of Blair's later successes. If your thesis that people are gagging for a leftwing party is correct, you should have seen the Green vote diminish as people move towards Labour to reinforce their leftward policy shift; same with the SNP. Instead, they both rebounded.
The reason for that is Labour needs a leader that can sell ideas, and an implicit part of being able to sell ideas is having the support of the largely Conservative and pro-business media in this country. I think you're right that people are largely misinformed and want policies that don't even help them, let alone the country as a whole. I think you're also right that the Conservatives are doing a great deal of harm to fundamentally important things like social mobility and provision for the most vulnerable. I
also think that Labour needs to accept that the only way it can do something about those is by changing the terms of the debate, something only possible from a position of power rather than outside it. Win an election, reform the electoral system and then you can change something.
I don't think Kendall is the answer; she's about as inspiring as a wet flannel, and I think Cyclops is absolutely wrong when he says policy position alone determines elections and therefore Kendall will do well. Policy position doesn't determine it, leader charisma in selling policies combined with a platform for that leader to sell from does and while Kendall might get given the second she couldn't do the first if her life depended on it, so the net result would just be what remains of the Labour Party collapsing in a demoralized heap. I do think, however, that it's important to bear in mind, in the long-term, what the Labour Party actually does require. 2020 is de facto lost already, so what we need to do is build the Jarviswagon now. The most important part of building the Jarviswagon is making sure the Labour Party doesn't implode altogether, which is what it is at grave, grave risk of doing even according to people inside the party right now. Corbyn has been a backbencher his entire life and his parliamentary cohort consists of about 10 MPs. Who is he supposed to form a cabinet from? The party would not last a week beyond his election, you'd see something like the SDP break-off of the '80s, it'd be disastrous.
Vote Burnham or Cooper, suck it up, and begin to make long-term plans.