Corbyn catches flak because despite loudly proclaiming how straight talking and honest and pure he is, he refuses to disavow Marx (rather: dodged a question asking him to in a classic politician style), and praised Fidel Castro, both men whose ideas and policies caused profound suffering on a massive scale. That rather implies that if Corbyn ever got anywhere near actual power he'd rapidly start abusing it.
Mandatory reselection after boundary changes should see to that.
Doesn't the UK have a similarly entrenched party system to Canada and the US, with first-past-the-post districts for MPs and all that?
But trying to coordinate your constituency to vote for someone from a minor party makes arguably a little more sense than demanding that politicians be sent to the guillotine, which is where my comment started.
[1] https://en.wikipedia.org/wiki/United_Kingdom_Alternative_Vot...