Mark Biddiss, who started a social media campaign to get Ding Dong The Witch Is Dead to number one in the charts, said buying the song was "a very cathartic experience for a lot of people who feel that for many years they haven't been listened to".
He was joined on ITV's Daybreak by former Conservative MP Jonathan Aitken who said the song, which is on course for a place in the top five in Sunday's Offical Chart, was a "pretty feeble form of protest".
More top news
The victims were playing the popular game in Whittington Park in Holloway on Tuesday night, when three males suspects approached them.
A former Royal Marine who was recently engaged has been killed in a climbing accident in the French Alps.
Through the day we'll see plenty of sunny spells but there will be a risk of showers too as they filter down from the northwest.