Blair and Cameron were successful because they followed that middle band of politics trying to appeal to all people. Labour won three general elections and would have probably won a fourth if they had appeared a bit tougher on immigration and Brown hadn't called that bigoted* old lady a bigot.
(*just jesting there)
The problem is that the old left wing couldn't ignore their social consciences of how they were turned from a protest party into one that governs. To do this they had to compromise to appeal to middle England, this is where Blair/Mandy and Brown understood to enact any social fairness you have to be in power to do so. By offering an alternative (or if you will, regression back into the party that spent 18 years out of government) all they are doing is blowing hot air out. Nothing to be applauded here at all.
Sentiment is wonderful, I would love a world without inequality, to have social justice, an end to nuclear weapons and famine and natural disasters and also let's have world peace while we are at it. It's how we deliver that manifesto is what counts, what is achievable? I think JC is like a kid at Christmas (strange that given the initials...
) who just has too many presents to open and he doesn't know where to start, so he opened them all at once.
If he goes after big business, big business will leave and let's see what that does to the tax income streams when jobs are lost.
His policies have been done before, it was called communism and look away if you don't want to see the result... (it failed!) Labour need to stop the trade unionists selecting their next leader, cause in 2020 they will be looking for another and hopefully this time they won't transport the party back to 1983.