There is a deeply disturbing use of pedophilic symbolism among a great deal of graffiti vandals. Especially in the areas they live/squat together in warehouses. If you know what the varies symbols mean and see how many of them do it, you realise many perverted people become graffiti artists to spread their code. This is but a small example in Hacnkey Wick where swirls and hearts dominate the "artwork" and bars. Even if you give some the benefit of doubt, keep looking, and you will see there's too many for it to be an accident. Look at these images and ask yourself what kind of people would create them.