Why did Truman decide to use the atomic bomb on Japan

i need 3 ideas and i already have
---less casualties
---it would end the war

Any more i just need one?

3 answers

It was available
it would save American lives, maybe save Japanese lives (soldiers were not giving up, but dying in battle)
it would end the war much sooner than invading japan
He wanted to end the war.
He was tired of americans dying on stupid islands inthe pacific fighting suicide fighters.
well im trying to write an essay to persuade truman to use it we have to go back in time so i will tell him it would end the war fast and saver others life

but i don't know what you suggested would fit in well thank you though(:
Of course what Bobpursley suggested fits in with your essay.

His first point is that the atomic bomb was available. No military force deliberately ignores a weapon that is effective and has been developed at a great cost of money.

The reasons that Truman dropped the bombs were:

It was an available and efficient (though horrific) weapon.

It would save thousands of American lives.

It would end a lengthy and deadly war much quicker than an invasion of Japan.