This sentence was written by Jean-Jacques Rousseau and was aimed at explaining slavery as something tyrannical and suffocating, which does not allow the responsibility and the rights of each man over himself, because it makes some men have too much power over others, while other men have no alternative but to completely obey the powerful, losing their freedom, autonomy and responsibility over themselves and their own actions.
The question is asking for an opinion. The reason Truman dropped the atomic bomb was because his advisors told him to do so. Truman believed it was going to bring the war to a fast conclusion. Hope this helped :)
