Why does Dumbledore trust Snape despite his history in "Harry Potter and the Half-Blood Prince"?
Because Snape made an Unbreakable Vow to protect Harry and carry out Dumbledore’s plan.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Why does Dumbledore trust Snape despite his history in "Harry Potter and the Half-Blood Prince"? [/INST] Because Snape made an Unbreakable Vow to protect Harry and carry out Dumbledore’s plan. </s>