A despicable robust cartoon

Why can't cartoonists seem to criticise Israel without the use of big noses and blood libels? And why do the mainstream papers still publish this stuff?
http://www.thecommentator.com/article/2577/sunday_times_blood_libel_cartoon_on_holocaust_memorial_day_no_less

European Jewish Congress President Dr. Moshe Kantor has called for an apology from the Sunday Times, which published a cartoon on International Holocaust Remembrance Day of Prime Minister Benjamin Netanyahu building a wall on the bodies of Palestinians, depicting their blood as cement. http://www.ynetnews.com/articles/0,7340,L-4337679,00.html

The Sunday Times defended the publication of a cartoon ...in Sunday’s paper that was described by the Anti Defamation League as “a modern day evocation of the ancient ‘blood libel’ charge leveled at Jews,” as “typically robust,” and claimed that the cartoon was not anti-Semitic, in an email to The Algemeiner.
http://www.algemeiner.com/2013/01/27/sunday-times-doubles-down-on-blood-libel-cartoon-calls-it-typically-robust/