This was covered on this forum just a couple weeks ago. In any event, the Einstein quote addresses it succinctly. The knowledge exists in the world, and science uncovers that knowledge.

And his era is instructive in this. Would it have been wise to not uncover the knowledge of nuclear fission, and to have allowed the Germans to uncover it? Ethical? Even though we ended up deploying the bomb in war, and have been the only ones to do so?