It's not about getting INTO Israel, it's about going to other countries when he has been to Israel.
Like, for example, Shakira is half-Lebanese and has never been to Israel, because if she had been to Israel she wouldn't have been allowed in Lebanon. (well I looked all over google and I didn't find anything to say she's been there :|)
I might be wrong though, for all I know the Lebanese government could make an exception to celebrities.