Cos he's a gonk that's couldn't win at Eve Online.
Spreadsheet Quest isn't a game that takes skill as much as it takes 1. *LOTS* of time 2. *LOTS* of cash (real cash) or 3. Both.
Not to mention if you're honestly that peeved at some guy who disabled another player's engines in ED then you should probably *NEVER* play EVE because it's at least 100 times more meaner, soulless and unforgiving.
Why would someone do that in ED? Because they can. As long as you're not violating the ToS/EULA/etc. then here is no right or wrong way to play the game.
As has been pointed out by numerous people already...that's why it's called Elite *Dangerous.
These threads about what terrible human beings players must be because they killed someone for no reason are downright comical. Is this really the first online game ever for some of the players here?