First, I think it’s likely that you hear more about one than the other because you read websites like Hacker News and are not (I assume) an FBI agent or someone else who works on this stuff. A public defender I know would say that child abuse of all sorts is ever-present and relevant to their work, unfortunately.
Second, detecting CSAM leads to its producers who are by definition abusers. Here’s a nice article in Wired about the digital forensics of cracking down on a CSAM ring with some interesting details about the role played by crypto, and abusers’ misconceptions about it: https://www.wired.com/story/tracers-in-the-dark-welcome-to-v...
With that said, I agree that a lot of political concern for this is a smokescreen for a creating more surveillance. “think of the children!” has the flavor of a rhetorical trump card.