1) Katherine brought Damon the cure.
2) Katherine has a plan B and a plan C and a plan D and well,you know how the alphabet goes don't you?
3) Katherine is the "safest psychotic cadela, puta in town."
4) Katherine looks out for herself, she will always look out for herself.
5) Deep down, Katherine really cares about both Salvatores. (- KW)
6) Katherine doesn't need a guy to save her. End of story.
7) Katherine believes in "Better you die than I."
8) Katherine drunk vervain for 145 years thus it doesn't hurt her.
9) Katherine isn't afraid to let loose and party when the occasion comes around.
10) Katherine...