Israel is not defending itself, it is terrorizing millions of Palestinians that live under its military occupation and military blockade. The settlements are daily violance against Palestinians, since the land they're on belongs to Palestinians, according to all world legal orgs, as well as Israel's own laws. Any Palestinian resistance to this Israeli violence against them is legitimate and a lawful right.
This is why trade unions, churches, universities etc., all over support Palestinians in their demand for a BDS movement against Israel. It is a non-violent response to Israel's crimes. There are Israelis who support the boycott too, like Ronnie Barkan, who below, called out Rabbi Scmuley for placing an ad in The Washington Post this weekend, calling popstar Lorde a bigot, because she chose to support BDS and cancel her planned show in Tel Aviv, after she learned about Israel's many crimes against the Palestinans (the wapo advert is within the link in the tweet, look at how ridiculous it is)
Free Palestine.