It’s unacceptable for Labour MPs to call the Conservative Party “institutionally racist” on national television.
It’s unbelievable to look at the racist Twitter feeds of Labour supporters on the appointment of Sajid Javid as Home Secretary.
It’s intolerable to have plausibly-deniable arms-length Labour-supporting thugs vandalising Tory offices and sending hate mail to Tory candidates.
So, “decent” Labour members, learn this.
You can tell yourself that you’re moderate, you can repeat ad nauseam that racism (and especially anti-Semitism) can’t have anything to do with you 'because I joined the Labour Party to fight that sort of thing,' you can look on in shocked disbelief as your internal Corbynite opponents delegitimise your centre-left position in exactly the same way that you’ve spent decades delegitimising mainstream Tories
(this is the key point I suspect you’ll never learn, to be honest: Momentum are only doing to you what Blair taught you to do to everyone else)
but while you’re enabling Jeremy Corbyn, while you are actively campaigning for him to become Prime Minister: you’re lying.
You can be a promoter of Jeremy Corbyn’s party, or a moderate. You cannot be both at the same time.”
(Graeme Archer, from an article on CAPX called Barnet shows that labour's poisonous politics don't work," which you can read in full here.)