The picture is from 2014 -- and that is relevant.The reason is that in 2014 much of what ISIS became was not yet known. The protest has a different context.
... from swallow's link: "For [Knesset member] Marzel, the court’s decision to release the asylum seekers back to Tel Aviv is “more dangerous to Israel than ISIS.”
It sure seems like the Israeli Parliamentarians were emphasizing the "danger" of the African refugees by comparing them to something that was already viewed as extremely dangerous, i.e., ISIS.
Of course it was all a racist show, from beginning to end - which is nothing at all in today's Israel - and they're mugging for the cameras, but they were trying to make the strongest case for themselves.