It's a minor point but the phrasing of this really gives the game away...
Everything YOU'RE doing for Palestine would be a million times easier and more effective under Harris.
Not what "I'm" doing. Not what "we're" doing. Even in the scolding premise they're admitting that they're doing fuck all and don't care. It's an explicit admission that they wouldn't do anything under Harris either that detonates their "I told you so" before it even makes contact with the reader.