The support of terrorists should be a resigning matter.
I don't believe JC does support terrorists. I believe that there is an orchestrated press campaign to smear him. I don't think he does any favours supporting the likes of Dianne Abbott - it is misplaced loyalty.
But on the subject of resigning matters - what about, expenses frauds (all parties), undeclared interests, "mistakes" about what is owned and not declared, nepotism, tax avoidance, moving assets because of insider information, promoting some activities eg fracking because of monetary self-interest, inappropriate sexual conduct . . . the list goes on and on.
All of our parties are largely corrupt - but I think that there is a core of honesty in the Labour party that doesn't run through the Tories.
The smaller parties (greens etc) are sadly too weak to provide a threat to the Tories.
Labour was destroyed by Tony Blair and is taking a long time to fully recover. Is Corbyn the best choice for leader? I don't know, but I believe him to be an honest individual who sticks by his principles. There aren't many of those about.
Our present government is useless and know it - they are just cashing in as much as they can before this country ends up in the toilet. They don't care about anyone who can't offer them a backhander. They don't give a damn about the environment (except in the Home Counties). and regard the North and the people who live there as totally expendable.