I do think the media has enormous influence over people's opinions. (They think so too - remember "It's The Sun what won it"?) The Mail, for instance, has been pushing for years the idea that migrants are either running the country down or blowing it up, and that benefit claimants live a life of luxury. (They should try it sometime...) Now they're doing a very successful hatchet job on Corbyn.
I don't think it is particularly extreme leftism to believe in prioritising the NHS, improving the carers' allowance, increasing the minimum wage to £10 p.h., requiring all rented accommodation to be fit for human habitation, banning zero hours contracts, and so on. Even if I wasn't a socialist, I would vote Labour to protect the triple lock, because I am a pensioner! Do we want to go back to the days of old people dying of the cold because they are forced to choose between buying food and keeping warm?
I would be ashamed to vote for a party which intends to fund anything by taking away allowances from bereaved parents, cutting the benefits of disabled people and obliging women to not only admit but to prove that their child was the result of rape. What a sickening bunch they really are.