Because he found out to make great cool discoveries the the invenstion of the bomb, but other scientists turned his discovery into a atomic bomb, which he thought was wrong. Thye soon blast the bomb on a country and he tried really hard to stop them but they didnt listen, soon countries developed their own bombs and shooted at the other countries threatiing them/
bc many people died they did nothing wrong and there city was destroyed which was also wrong to do that bc they spent all that time to creat those bilding and monuments