If Quirrell was actually afraid of Harry ending the world, then Harry would be dead.
Quirrell might, in some manner at least, survive the ending of the world (although I note that the resources available to him after the world is gone do not support a convenient resurrection.) But Harry may have usefulness to Quirrell which is worth whatever risks he poses. Even with Quirrell’s great edge in raw power and experience, Harry has already developed magics which Quirrell is not capable of.
One of my pet theories is that the reason Quirrel ever became voldemort is to take over the wizarding world in order to take over the muggle world to prevent them destroying the earth with nuclear war, which is the only thing he views as a serious threat to his long-term continued existence. He might risk harry ending the world if he’s trying to stop another end of the world risk.
Quirrell might, in some manner at least, survive the ending of the world (although I note that the resources available to him after the world is gone do not support a convenient resurrection.) But Harry may have usefulness to Quirrell which is worth whatever risks he poses. Even with Quirrell’s great edge in raw power and experience, Harry has already developed magics which Quirrell is not capable of.
One of my pet theories is that the reason Quirrel ever became voldemort is to take over the wizarding world in order to take over the muggle world to prevent them destroying the earth with nuclear war, which is the only thing he views as a serious threat to his long-term continued existence. He might risk harry ending the world if he’s trying to stop another end of the world risk.