We're going to dig in to the back story here, so, due warning: spoilers below, for those who've not yet caught up on the show. 

At the beginning of the season, we learn that Tory, played by Peyton List, has a tragic home life. As summed up by CBR, her mom is severely ill, leaving Tory to act as nurse to her mother, look after her little brother, and take on the role of breadwinner for the family. Working two jobs, getting harassed by her landlord, and expelled from school, her only champion is uber-villain Kreese, who gives Tory an outlet for her anger: karate.

The softer side of Tory, the one that leads her to provide for her family, doesn't seem to match the disdain she holds for her rival Sam. The final straw seems to come when she leads the charge to attack her rival's karate dojo for no reason other than blind hate caused by jealousy. Reddit user EatCakeGirl44 points out that Tory's behavior is so "criminal and psychotic," that it may not leave room for redemption, "after the amount of intentional damage she's inflicted on others." 

However, plenty of fans still sympathize with Tory, seeing her as a troubled girl that needs help and guidance. Redditor __Haku__ notes, "Tory hates Sam ... because she wants what Sam has (a privileged life) ... I see her behavior as wanting to prove to herself that she's better than Sam."