there are laws against broadcasters broadcasting hate speech....however if they were to include this on the news, they may get away with it.
in this day and age, it won't be long before this is all over social media, so the Beeb have no need to show it, as we'll all see it anyway (if you've not already seen it).
When the mad mullahs chant death to the infidels, we take it seriously and make reference to extreme points of view. I'm not sure why this would be any different, its just reversed.
There are ways and means of promoting your viewpoint and making it clear our government are complicit, and the Israeli state and the IDF have a lot to answer for.