Why Jaime killed the mad king?

Related questions

1. Is Aegon Targaryen alive in the books?
2. Can Valyrian steel kill dragons?
3. Do all targaryens not burn?
4. How does Aegon Targaryen die?
5. Why does Brienne name her sword Oathkeeper?
6. Who has the lightbringer sword?
7. How does Ned Stark die?
8. Who has Ned Stark's sword?
9. Is needle made of Valyrian steel?
10. What is Jon Snow's Targaryen name?

Tags

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2. #aerys
3. #cersei
4. #baratheon
5. #greatest
6. #targaryen
7. #marriage
8. #jaime
9. #swordsman
10. #killed
11. #throne
12. #kingdom
13. #robert
14. #derisively
15. #virtue
16. #kingslayer
17. #perhaps
18. #westeros
19. #called
20. #sometimes
21. #because