The point regarding seeing the world from anothers view reminds me of 'Story of your life' by Ted Chiang, a brilliant short story that also has a movie based on it (Arrival) which is also my favourite movie despite the, imo, botched ending.
Spoiler alert:
As the lead character learns the aliens language and can now interpret time and generally the world they do, you get to a different kind of consciousness.
As I type this out I relaize its actually kind of off topic after all lol.
I think they're talking about "justified" madness. Realistic madness is just seeing things that aren't there, or reacting extremely to mundane stimuli, but if you had somehow been given comprehension of some higher truth about the world that nobody else would ever believe, the actions you take as a result of that knowledge might seem crazy to those around you, even if they're perfectly logical from your enlightened perspective.
for a sample of such madness please try arguing with someone about a topic you're very familiar with, and they clearly know fuck all about but refuse to learn or listen to anybody but themselves and their echo chamber!
In the USA, recently more people died of "excess deaths" than from all wars combined, and this on top of our regularly scheduled culling of kids in schools, our democracy is already converted into a totalitarian regime due in part to an infamous SCOTUS (court) ruling, but it's probably climate change that will kill us all within it lifetimes, oh yeah and virtually nothing on the internet works quite correctly anymore.
Today is Thursday btw, and you know what that means - looking forward to the weekend, whoo-hoo! :-P