Because people with zero interest in defending through a reasoned argument the person/direction they are advocating don't actually deserve more.
Frankly the Corbyn is a Doodie head argument is irrelevant, I've outlined a collection of disastrous mis steps in handling Brexit alone, by this current government and May specifically, one of which includes the General Election being called 2 minutes after enacting Article 50. Not once have you attempted to discuss this, your entire argument appears based on your opinion that "Corbyn is Rubbish". At least those who disagreed earlier, that inward investment ala post WWII keynsian Governments could be a way forward attempted a reasoned argument that went beyond disliking Corbyn personally.
As for the "Safe Spaces" debacle, yes the massive problem of some universities having some stupid policies (and even the direction that could take), is far worse than the regular deaths of people at the hands of Terrorists (mostly nationalist terror in Europe, if Interpol are correct).