If it's any consolation, often in these sort of large scale outages at least part of the cause is management pushing back on recommendations by the IT staff.
I think context matters a lot, and this photo was posted to a page called "Offensive Humor" so people know the message is wrong and offensive, I doubt anyone would actually be on that page seriously agreeing with that message or being influenced to carry out its message. If this was posted to a page called "Women are scum" or similar etc then the photo would have a different meaning.
The little known law they quote is actually very well known if you are an ISP / carrier. But the law is not a legal mandatory filter requirement - just a requirement that you "reasonably provide assistance when asked" It just happened that most of the ISP's when asked in this case decided to comply, but importantly not all complied.