Olly is a stupid little kid in a man's world, but he thinks he can play with the big boys. He betrays the one person who protected and took care of him. Jon Snow avenged Olly's potato-eating family by personally killing Styr, and doesn't even get mad when Olly kills his girlfriend. And then Olly cowardly betrays and stabs him, while looking smug when Alliser gives his "I KILLED HIM" speech. And even after everyone wises up and surrenders after Edd and the wildlings surprise Thorne and his men, Olly has to ruin the moment by doing a stupid charge attack on Tormund. We better get an "Edd, fetch me a block" moment with him next episode.