[SPOILERS] Game of Thrones - Season 5

[mgdwszx]

I still have no idea why they killed Jon Snow ;-;

the same reason they killed ned stark, catelyn stark, rovb stark, jeyne westerling, joffrey, etc...
it was written in the books...
and if you're talking about thorne and his band of betrayers, because they don't understand jons decision. they can't see the bigger picture, though Jon admittedly was a bit foolish in not paying attention to the attitude of his men, and doing this regardless of his men's opinions