It’s true that cities without a large Muslim population have a smaller chance of a terrorist attack, although it has changed now to countries without a large Muslim population since they can travel to commit carnage. You’re also correct when you state that there are lots of Muslim apologists, both in London and in America. But the original charge and the one which spread around the Internet like wildfire was that Sadiq Khan basically said that if you lived in London terrorist attacks were like the weather, something that you had to put up with. He never said that, which is all I’m pointing out.
I am a native English speaker...as I assume you are as well.Although I'm no Mensa member...no William F Buckley...I'm inclined to believe that I have at least a fair command of spoken and written English.
And that command,however strong or weak it might be,tells me that that's exactly what he implied.
Of course your mileage may vary.