I know it was terrible to lose it, but what was inside the library that made it a tragedy? Original manuscripts of the Gospel? The secret to Roman concrete? The secret to Greek fire?
This question is so popular it found its way into the FAQ of this subreddit. I don't want to discourage further discussion, but in this thread u/XenophonTheAthenian explains why the loss of Library of Alexandria was not that tragic as one might suppose.