Americans simply had to bomd Japanese cities;
1)Japanese army commit much more crimes than german army. So bombing Tokyo or Jokohama was just a justice.
2)Japan industry first was similar to european but after first bombings has been moved from big factories to small factories into cities. If Americans want hit these factories, they had to destroy cities.
3)Without view of burning cities Japan emperor would have never forced his generals to peace. He stopped war when he saw that Japan can be simply burned.
4)If Americans did not bomb Japan and invade island, loses would be much bigger.
All in all - if was bloody, terrible for pps who lived into that cities but...
Japan got what they wanted.