I am not trying to convince anybody, or create any image of British or American dads or generalize it as something being done by everybody or happening everywhere. I simply mentioned what I saw during my few visits to London, and tried to explain my opinion since you commented on it. Unfortunately, there is no crystal ball to tell if the turd came from an immigrant or local orifice.
I believe you saw what all Western nations see now, after the left changed all of our immigration laws in the 1960s and early 70s.
I doubt that the more traditional Brits have taken to defecating in public, and I sure know that the traditional Americans haven’t.