"Přicházela noc. "Jaké to asi je?" uvažoval. "Zůstal tam trčet. Myslí si, že je úplně sám a že jsme ho hodili přes palubu. Jak se to může podepsat na… - Andy Weir

It’s true, you know. In space, no one can hear you scream like a little girl.

But really, they did it because every human being has a basic instinct to help each other out. It might not seem that way sometimes, but it’s true.

If a hiker gets lost in the mountains, people will coordinate a search. If a train crashes, people will line up to give blood. If an earthquake levels a city, people all over the world will send emergency supplies. This is so fundamentally human that it's found in every culture without exception. Yes, there are assholes who just don't care, but they're massively outnumbered by the people who do.