I don't find it funny at all.
And if this is the Israeli way to show the world that there is violence by both parties then I must tell you that it's working.
I'm a complete outsider and there are millions in the world like myself. The first thing we'll ask ourselves while watching the video is "Why is the girl having a knife at all?", "Why did she stab the guard?". Having a knife when she shouldn't and then stabbing a guy implies a plan. She probably planned to do it all the way, before she even left home.
Then we ask ourselves "How many Palestinians there are who also do that? How many of them there are who go out on the streets and stab or shoot at random Israeli folks?
I have some knowledge about the conditions these people live in (I own this knowledge mostly to you, Reb) and I think I understand what makes the Palestinians do what they do. I'll never support them for doing it, though.
But there are millions who don't know that and when they see such videos where cold blooded murders happen on both sides, then many of them will say "Leave them alone so they can kill each other" and nobody will find any understanding for your people until they don't stop killing random Israelis.
Such murder attempts like the one on the video only put Israel in a better position.
It's a very tricky lose-lose position for the Palestinians. They can't just sit and wait for their death and they can't cold-bloodedly kill random people because it gives excuses to Israel in front of the world to continue doing what they're doing.