There's nothing wrong with opposing and discussing the downsides of popular policies. What's counterproductive is saying that the policies aren't actually popular and people were just, in the author's words, "bamboozled into supporting the measure". I've seen many people (including a friend) with that attitude, and it makes engaging with anyone who does support Prop 22 impossible, because you're forced to assume they either don't know what they're talking about or don't mean what they say.