If i died on one of those busses i would still want people to take the piss out of it.
I'm on the tubes and in and out of london occasionally with work so am nowhere near "untouchable" but i still would sooner laugh at it than just walk around in fear the whole time.

I think the british ability to laugh in the face of a genuine threat is a great character treat and is one of the few things that still makes me feel patriotic.