That's the sort of thing that enables Tommy Robinson and his ilk to thrive, not "lefties".
She didn't say it was 'lefties' who did that, did she? She said it was the failure of the police to take action against the abusers, and the failure of the media to cover it, which led to people like Robinson speaking about it and making it into a race issue.
Julie Bindel said much the same thing.
Well over a decade ago I was interviewing these “deniers”, and being fobbed off by social workers, police officers, and some newspaper editors who refused to accept the scale of the abuse I and other campaigners (including the mothers of some of the victims) had uncovered.
Many years before the award-winning journalist Andrew Norfolk wrote his first piece about the grooming gangs in northern towns in England, I was investigating this phenomenon. But despite the quality of material I had amassed, it took me until 2007 to get my first piece published because some editors feared an accusation of racism. In this particular geographical area, many of the members of grooming gangs were of Pakistani origin. As a feminist who has always gone after the men who abuse women and girls, whichever social class or ethnic group they belong to, I was concerned that the story would only be told by racists. The British National Party (BNP) had been already been claiming that nasty Muslim “paedophiles” were preying on innocent white girls.
https://www.independent.co.uk/voices/three-girls-drama-child-sexual-exploitation-rochdale-blackpool-pimping-a7739006.html
She doesn't fact check her content.
I think saying she sometimes speaks without thinking or without checking before repeating what others have said is a fair criticism. But a lot of people do that, including lots of MPs who then look like utter muppets when their idiocy is recorded in Hansard.
But if she had come across one of the old news articles about Charlene Downes she might have just thought that repeating what was said in court at the time was a reasonable thing to do. There's a limit to how much fact checking someone's going to do for something as trivial as a youtube video. It's not a peer reviewed research paper, evidence before a court or a speech in parliament.