Indeed.
I'm not even making a judgement on Corbyn here. People can love him or hate him, either way it doesn't change the fact that by splintering support, under our voting system, you only strengthen the opposing side.
It's like... one of the headline problems with FPTP as a system.
At the very least, Sultana and Corbyn could've joined or allied with an existing party they align with, the Greens. Seriously look at Corbyn's recent remarks and his open letter, and Sultana's too.
There's basically no distinction between them and the Greens, yet they're choosing to battle against them in each constituency? It's just electoral self-harm.