I have no idea. Agree that's a very important uncomfortable question.
If the left can't speak on it at all then the only voices on the subject will be people like Katie Hopkins, writing in the Daily Mail;
"Jeremy Corbyn says this is an attack on the vibrant multicultural cities we all know and love.
No, Jeremy, it isn't. It isn't. You stupid man. It's an attack on France, on French sensibilities and the French way of life. Mostly, it's an attack on parents and children.
Don't use this attack to defend multiculturalism. We don't all love multiculturalism. We don't all want equality the way you see it. We don't want to live where we are second-class citizens in our own country.
And I blame you. I blame you and every other zealot who tells me race is not an issue. I blame you who tell me all migrants are welcome. I blame you who tell me I am a racist when all I am is proud of my people."
etc.