iFixit is safe because it doesn't really affect Apple's sales. It may put a slightly downward pressure on Apple Store repair revenue. But iFixit solutions require technical aptitude, time and skill to apply that most people don't have, and wouldn't spend on fixing a laptop even if they had it!
But what if iFixit sold a dohicky that defeats the copy protection on all software written for macOS? Do you think that's okay, and that their right to share that device is free speech?
The issue I have is that they target people who figure out how to run and copy cracked game from their device, and not those who are actively distributing them. While it makes perfect sense from their side, the images from the tweet feed do not present a compelling argument that the modders are breaking the law and as such they are intimidating law-abiding citizen which is horrifying.
That's all that matters.