This means Bradley Burston is addressing quite a lot of people. And he asks a loaded question:
When a leftist places quotation marks around the word rockets, when a leftist terms attacks on civilian populations a matter of human nature, when a leftist dismisses rockets as crude, homemade, and unguided, or blames Israelis for their use, when a leftist notes that rockets have killed "only 28" Israelis, or sniffs or jeers at the fact that one out of seven Israelis, one million in all, are currently in rocket range – it may be time to ask, what it is, exactly, that's supposed to make a person a leftist?Good stuff, do read it all.