I like Jeremy Corbyn. However (how do you like that, Michael Gove?), I have seen a worrying number of people saying that they will vote for him. However, this in itself is not a problem, I will probably vote for him myself, but I've seen many Green Party members saying that they are going to pay their £3 to register as a Labour party supporter, vote for him and then leave. Not only does this go against codes of the both the Green Party and the Labour Party, as they don't let you be a member of two parties at once, but it's also incredibly underhanded. If you want to actually support the Labour party then please do join the party, but don't join just to select the leader that's most like the party you actually support. If you are a Green Party member reading this, remember that it's undemocratic, and that you're taking away the value of the vote from actual Labour party supporters, who may vote for Corbyn, but could equally vote for Liz Kendall, Andy Burnham or Yvette Cooper, and while you and I may disagree with them, their views are equally as important as the Labour members who like Corbyn.
A slightly more worrying trend, is the hashtag #ToriesForCorbyn. This is particularly smug and self-righteous, with a small number of Tory members and supporters paying their £3 to the Labour Party (why you would want to give money to a party you disagree with, I don't know) to vote for Corbyn in the upcoming leadership election under the assumption that he will be completely unelectable as a prime minister and help the Tories. This is basically the political equivalent of corporate sabotage. However, I don't personally think it will work. It's pathetic that some Tory supporters feel the need to try and destroy the opposition, rather than let them do it of their own accord or even better rely on their own merits.
So, why should you vote for Jeremy Corbyn? Well, there has to be a prerequesit that you actually support the Labour Party. You should avote for Jeremy if you believe in proper socialism, an end to austerity, and think that he's a pretty cool bloke. That's it. However, please only vote for Corbyn if you actually support Labour because if he does win, I don't think anyone, including him, want it to be because of some sneaky members of other parties and have it hanging over his head for the tenure of his leadership.