I agree with Durutti and Mauvais, to a point, the Uk Left is guilty of faux internationalism and grandstanding (particularly in the past, eg SWP.) But it also has a history of genuine internationalism: Int brigade, food for spain, nigaragua, anti-apartheid, palestine etc. Many of these interventions made some difference. I also think in this instance, he was a very young boy, its bloody tragic and i can see why it resonates with other young men and women in antifa, etc, in fact its quite moving they want to honour him.. My problem is a wider point: it shouldn't be either or, solidarity here is sadly generally directed towards other countries and struggles rather than just occassionally at home.
Durutti is right, the organic link between the left and 'the masses'(dreadful term and useless in a time of extreme individualism,) is broken though Orwell would question whether it ever existed, I would say it definitely did in some ways from about the misery of WW1 and the comradeships forged in it, to the 1970's.
anyway, as the poster for the event says
Carlos Presente...