Soapbox Preacher?

I don't generally do "topical" preaching, where you decide what you're going to talk about and then find Scripture to go along with it. We were taught in seminary that topical preaching is Bad, and I'm prone to agree. Usually. But this week I am preaching about health care. I have thrown the lectionary out the window. I don't really know what I'm going to say, as there is a difference between spouting forth my opinion on the issue (which I could easily do) and preaching about it (which I wish to do, and which is more complicated). That said, Ezekiel 34 isn't exactly subtle, and I probably won't be either. Now....what to say?