So, somehow, if we agree with one side we have to agree with the other, since they are both officially called "climate scientists."
You don't get my point, I guess. My point is that the detractors agree with climate scientists who say that the climate has varied over the past thousands of years and use that as their evidence that the current change of climate is consistent with this past history and therefore there is no such thing as anthropogenic climate change.
There are another group of climate scientists who say that the current usage of fossil fuels is leading to a change in climate that is inconsistent with this past history. Yes, they may not be the same exact group of scientists -- though it has not been presented by their detractors that they are not the same group or have some amount of overlap.
But the foundational science, the physics and chemistry, between the study of historical and current climate change is not different. If the detractors were willing to come forward with actual scientific arguments against anthropogenic climate change it might be worthy of debate. But when they say "the climate has always been changing" as their evidence that doesn't meet the mark.
Perhaps I tried making my point too succinctly and you couldn't follow the logic. I just find it interesting that the detractors seem to have no problem with the physics and chemistry that lead to a conclusion they agree with politically but then have a big problem with the very same physics and chemistry when it leads to a conclusion that they find politically inconvenient.
So, no you don't have to automatically agree with "two sides" of climate scientists, but you do have to have a good reason for disagreeing with one side while agreeing with the other. It can't just be political expedience. That's not how science works.