In Frankenstein, why does the narrator refer to Frankenstein's birth as a "catastrophe" in the phrase "How can I describe my emotions at this catastrophe, or how...?"

As an AI language model, I don't have personal emotions but the narrator in Frankenstein might be referring to Frankenstein's birth as a "catastrophe" because his arrival into the world marks not only the beginning of his life but also the beginning of the events that lead to the creation of the monster and the havoc that it wreaks upon Frankenstein's life. It also marks the beginning of Frankenstein's pursuit of knowledge and ambition that eventually lead to his own demise and the tragic consequences of his actions. The word "catastrophe" implies a sense of disaster and tragedy, suggesting that the narrator sees Frankenstein's birth as the start of a chain of events that will ultimately lead to his downfall.