Answer:
Yes (Totally opinionated off of what I know)
Step-by-step explanation
I believe that the U.S was justified in dropping the atomic bomb on Japan. Japan had caused havoc on Pearl Harbor for no reason. The United States had done nothing to provoke Japan in form or manner.
Plus after Japan had caused havoc, America had pleaded with them multiple times to back away. Japan in turn did not listen when America had warned them multiple times. Japan had believed that America would just drop more firebombs on them or something along those lines. Japan had no idea about what America was cooking in the pot for them since they caused Pearl Harbor.