Now, consider this. A human life is on average 80 Earth years or around 30,000 Earth days. Which means they are born, they make some friends, eat a few meals, they get married, or they don’t get married, have a child or two, or not, drink a few thousand glasses of wine, have sexual intercourse a few times, discover a lump somewhere, feel a bit of regret, wonder where all the time went, know they should have done it differently, realise they would have done it the same, and then they die. Into the great black nothing. Out of space. Out of time. The most trivial of trivial zeroes. And that’s it, the full caboodle. All confined to the same mediocre planet.
Humans, as a rule, don't like mad people unless they are good at painting, and only then once they are dead. But the definition of mad, on Earth, seems to be very unclear and inconsistent. What is perfectly sane in one era turns out to be insane in another. The earliest humans walked around naked with no problem. Certain humans, in humid rainforests mainly, still do so. So, we must conclude that madness is sometimes a question of time, and sometimes of postcode. Basically, the key rule is, if you want to appear sane on Earth you have to be in the right place, wearing the right clothes, saying the right things, and only stepping on the right kind of grass.