Slight correction: The bombing raid happened after Japan had decided to accept Hirohito's subordinate status to MacArthur, but before Japan had informed us of this fact.
According to you, the bombings on Hiroshima and Nagasaki are Japan's fault because they were given the opportunity to surrender.
What a dump!
Look, I will tell you the following, Japan was fighting "one to one" against the US. This is the fact.
When the fight is "one to one" there is the understanding that both have equal chances to win. For example, when the great Spanish Royal Navy fought against the smaller but smarter England Royal Navy, the narrow place of the combats favored the England Navy.
So, when the fight is one against one using conventional weapons, the victory might be obvious or a sudden surprise of defeat for either side.
The US never warned Japan about using atomic bombs in case they don't surrender. Can't you understand it?
If a person living ten blocks from your house and becomes your enemy and tells you, "look, if you don't surrender I will drop a bomb that will destroy your entire block" and he shows you pictures of the power of his bombs, then you understand that this is not a fight with knives and guns anymore, but that your enemy has a powerful destruction means and that he will use it if you don't give up.
So, without the warning of those powerful atomic bombs, Japan continued fighting the "one to one" war.
If somebody must be blamed, it's the US, because the army used a non-conventional weapon that killed more than 100,000 civilians in one day. That is a war crime.
There are no records of the US army warning the 350,000 people living in Hiroshima, saying that they must migrate because an atomic bomb will be dropped over their city. So, any statement implying such a thing is silly propaganda.
A myth aroused from the atomic bombings in Hiroshima and Nagasaki is to say that the dropping of those atomic bombs has been "Japan's fault".
Nobody but you and a few ones believe such a lie.