In the first two comics, the children use simple, innocent questions to handily demolish common claims by climate scientists: that global warming models predict no snowstorms ever again, and that specific models of cars cause local weather patterns. In the last strip, the she-beast scores a point against Obama using a complexly worded tenuous analogy, in that charming way young children often do.
This strip appears to be implying that three major religious groups are retarded and naturally inclined to violence. Which religions I'm not entirely sure because I'm not clear what major religion wants to blow up the entire planet. Probably Presbyterians. Never trusted them.
You can see why they used the technique here: If an adult said this, they would just be an asshole maliciously stereotyping people with broad generalizations. But a kid and her horse, they're just calling things like they see them.
In the real world, kids that say actual childishly misunderstood things get indulgent chuckles. Kids that try to make smug pseudo-deep statements, whether about politics or anything else, are usually going be less endearing to adults:
Yes, I acknowledge that there are political cartoons out there that don't hit any of these pitfalls and get their message across clearly and intelligently. I don't want to say you'll have better odds of being struck by lightning, but I will anyway.
Check out more from Christina, in The 5 Biggest Mistakes Women (Like Me!) Make On The Internet and The 5 Miserable VFX Jobs That Make Movies Possible.