Well, if we are to each give our opinions of cartoons, I might as well give mine.
This is like when you go to an open discussion about, say, tax inceases. The topic is about the possible increase coming soon, but you are the one against the tax increase and you go to state your position and make your voice heard. Even if you're not exactly what the moderator/leader wants, you are presenting an alternate point of opinion for people to think about, agree with, or argue with. As long as you're not talking about, say, the gas mileage of 2006 Volvo S40 sedans (which would be off topic) and are staying focused on something (i.e. the counterpoint) it should be acceptable.
This example above can be translated to this section of the forum as to why I wrote what I did. In a way, this is a problem of democracy, but in another sense, it is a free-speech environment working at its finest.