If we discover the means to travel faster than light, but researching and developing the technology means that the Earth is destroyed in just a few decades, should the technology still be pursued?
Edit: A bunch of yall don't seem to grasp the concept of a theoretical question
I don't think a civilization which would destroy their home with the single-minded goal of spreading throughout the universe in the blink of an eye should be allowed to spread beyond their local star system at all. Maybe re-evaluate after giving them a few centuries to mature.