The Krays simply put were bullies, They stole money from the working class people around their part of the city, They were violent theifs, Gun crime, Knife crime the lot, Crime with knifes is probably more documented than crimes with guns these days but people don't seem to mind that the Krays hacked people to bits in the 60's and to a point idolise them for doing so!
London wouldn't be a better place now if the Krays were still around, They wouldn't have stopped immigrants coming in because it would have been somebody else to rope in to doing their dirty work for them and giving them a p