Working for an Arab-Israeli client

So I got an offer to work as remote contractor from a Palestinian/Arab Israeli citizen client on freelancing site. Initially, I don't know he is from Israel since he posted the job under US location. Then he introduced himself as Palestinian, his name is Arabic name, and yes, I googled him and found that he is Israeli citizen with Palestinian descendant. I am confused right now to accept or decline the offer since I always support Palestine. What should I do?