> The murder in that news story was not triggered by the anti-litter. It seems highly likely that he murderer was already out for blood
What makes you think that? From the story it seems clear that the confrontation took place due to the victim questioning the murderer's right to throw litter in to his sister's car.
Sadly, young men who would kill over such a minor thing as this are not uncommon in London.
I have difficulty imagining a person with the mindset "Violence is not the answer, excepting of course that I will fight to the death to defend a man's freedom to throw his trash in another person's car"
What makes you think that? From the story it seems clear that the confrontation took place due to the victim questioning the murderer's right to throw litter in to his sister's car.
Sadly, young men who would kill over such a minor thing as this are not uncommon in London.