Hans motiv avslöjas delvis i boken, men hans sanna bakomliggande motiv kommer alla att avslöjas senare .
Detta är från hans wikisida :
Petyr was born to a small and insignificant house, spending most of his adult life trying to rise above his lowly birthright and become something greater, craving for power and status. He possesses considerable skill in commerce and coin, and is a master of court intrigue, his brilliance matched only by his ambition and his gift for political improvisation. He is often underestimated by many high lords due to his low birth (a mistake that often comes back to haunt those who make this assessment).
Det viktigaste här är att på grund av sin första rättighet begär han kraft. Medan Lord Varys, på sin egen väg, letar efter "riket", bryr Baelish bara om sig själv.
Nu, från avsnittet du beskriver :
Petyr then kisses Sansa, but before she pulls away from him, Lysa sees them. She later summons Sansa and confronts her near the Moon Door. Lysa grabs Sansa, and pushes her down to her knees near the opening of the door, telling her that all her enemies have gone through it. Petyr arrives and tells Lysa to release her, promising to send Sansa away. Lysa releases Sansa, and Petyr goes to her, but he admits that he only ever truly loved Catelyn, and pushes Lysa through the Moon Door to her death.
Detta visar tydligt en minimal mängd anledning bakom sitt beslut. Som alltid ger böckerna mer insikt:
When dying, she reveals that Petyr had convinced her to poison her previous husband, Lord Jon Arryn, claiming it was to prevent him from sending her young son Robert away to be fostered. Lysa, who was fiercely protective of her son, did his bidding. Sansa also hears that after Jon was killed, Petyr convinced Lysa to write a letter to her sister Catelyn stating that Lord Arryn had been poisoned and that the Lannisters were responsible. The killing is blamed on the singer Marillion.
Så medan det beskriver vad som hände är det här orsakerna (som vi känner till hittills) för varför det hände:
Petyr manipulated Lysa into the killing of Jon Arryn that led to Ned going to King's Land and "started" the entire saga. He knew he could rely on Lysa, by playing on her love for him. It's clearly revealed in the book that he is playing on this love. He never truly wanted her. Her outburst made her too dangerous to live. She revealed his participation in the death of Jon Arryn and the fact she saw him kiss Sansa meant Lysa couldn't be trusted to act as Baelish wanted her to. What if she were to reveal to someone what he did? What if she were to reveal to someone his current whereabouts, in a fit of rage? What if she were to hurt Sansa, a woman who could be wed to either Baelish or someone of his choosing and as a result of the death of Robb would inherit Winterfell? No - there was too much risk and so he had to kill her. We don't know what his final goal is, but its clear that Baelish has lofty ambitions and is playing in the Game of Thrones.
Slutligen är detta en intressant del av trivia om hennes död:
The book shows that Marillion is blamed for the death (and is tortured until he confesses). Whilst he wasn't present in the TV series, he was the character who was caught earlier in the series singing derogatory songs about Robert Baratheon. Joffrey gave him a choice between losing his tongue or his hands. He begged for mercy and his tongue was cut out. Whilst this does happen in the books, it happens to an unnamed singer, not Marillion.