Despite Theon's assimilation to the Stark family, (befriending Robb Stark, the eldest of the children, and mentoring the other children of the family) he still knew that if his true father rebelled against the Throne again, Ned Stark would not refuse to kill him. In knowing this fact, Theon felt out of place and romanticized his arrival to his true home but was instead greeted by a barren homeland and a bitter old man that was his father; he then realized who his true family was. With this imagination, Theon's desire for love (in this case, his father's), is evident which correlates to Frankenstein's Creature's desire for the same aspect; both of these characters reflect the human condition of loneliness.
"Another circumstance strengthened and confirmed these feelings. Soon after my arrival in the hovel I discovered some papers in the pocket of the dress which I had taken from your laboratory. At first I had neglected them, but now that I was able to decipher the characters in which they were written, I began to study them with diligence. It was your journal of the four months that preceded my creation. You minutely described in these papers every step you took in the progress of your work; this history was mingled with accounts of domestic occurrences. You doubtless recollect these papers. Here they are. Everything is related in them which bears reference to my accursed origin; the whole detail of that series of disgusting circumstances which produced it is set in view; the minutest description of my odious and loathsome person is given, in language which painted your own horrors and rendered mine indelible. I sickened as I read. `Hateful day when I received life!' I exclaimed in agony. `Accursed creator! Why did you form a monster so hideous that even you turned from me in disgust? God, in pity, made man beautiful and alluring, after his own image; but my form is a filthy type of yours, more horrid even from the very resemblance. Satan had his companions, fellow devils, to admire and encourage him, but I am solitary and abhorred" (Shelley 131).In the Creature's case, his own creator despised him. Subsequently, he sought love from anyone he encountered by partaking in benevolent acts that consisted of favors and received nothing but horror from the people and mistreatment which was solely due to his appearance. Naturally, this inspired hate within him and fueled his rage against humankind; he vowed to kill and inspire fear. Theon, on the otherhand, attempted to emulate the culture of the Iron Islands because he knew he could never be a true Stark. Later on, when he comes home to propose a battle strategy alliance between the Starks and Greyjoys, he proudly wears his house sigil and his best clothing to present himself to his father. He, however, receives rejection and humiliation. In order to prove himself to his father, he chooses to betray his best friend and take the North from the Starks to showcase his capabilities and loyalty to his family.
(video: https://www.youtube.com/watch?v=wpOj42JinWc)
Despite his plethora of flaws as a character, the underlying secret he has that many fans of Game of Thrones fail to see because of his betrayal is his quest for love. He has what some people may call, "daddy issues" which is often seen in a negative light presently. In my opinion, I believe it is natural to seek the approval of parents. In my life, it has been a big aspect that I once struggled with. Not that I believe his actions were completely justifiable, but I do see his reasons behind his actions. Another underlying secret is the reason behind his love for whores. It is often seen as part of the "Ironborn way", zeitgeist of the time period, and male sexuality but I believe that it his way of feeling dominant; In the act, he can assert his strength. He also tends to forget his insecurities with women and his arrogance. His castration may also act as a symbolic act and defense to my previous assertion because after the event, he lost himself as a man, and as himself. He lost his prized possession and was left with nothing. Without this security and false sense of confidence he established with it, he was forced to rebuild himself as an individual and sought to do so by assisting the Starks who happened to be in turmoil. All in all, it as indisputable that he inflicted pain because of his flaws as a character, but the loneliness he faced has arguably caused these conflicts to occur as well as it did with the Creature; both of these men reflect the flaws of human nature.
So my question to you after reading this regards to your present feelings of Theon Greyjoy. Are his actions justifiable or should he still be despised as a character? In the beginning I was despised both Theon and the Creature because of their actions, but after learning their stories I soon became internally divided on how to feel about them. OHHHH THE FEELS. Dill with it.