There are some players, generally newer, that are don’t understand what type of game they are playing. They don’t realize they are in competition with other players, and when they make a misstep and lose a ship unexpectedly, they declare the game is broken even though exploding ships is a major feature, not bug of this game. There aren’t that many of these I think, and they either learn what type of game this is and stop complaining, or quit, rather quickly.
But most are just butthurt as @Quelza says. They direct their anger outward at others or the game mechanics because they have trouble accepting responsibility or even the possibility that they could have been outplayed by another human. There are many targets for their anger: sociopaths, blobbers, gankers, multi-boxers, overpower ships, their ship is underpowered, “unbalanced” mechanics that make things unfair, corrupt devs… The list is endless, even though in almost all cases, there was nothing nefarious about the loss and they were just unlucky or outplayed.
I’d like to think when most calm down, they realize how silly they were and hopefully learn from their loss a get on with playing the game. There are some personality types that can’t handle losing though, and those are the ones that keep coming back to the forums to complain how they lost something “unfairly” even if they intellectually understand that this is a competitive game where stuff gets lost.