Well, you could argue that Japan's surrender in 1945 was motivated entirely by bombing. The home islands were not invaded.

Partially motivated by bombing, I'd agree. To set the stage, the IJN had once been the most powerful navy in the world and was reduced to only a few destroyers. The air force was down to a few hundred planes, lacked experienced pilots, and had no fuel to train them. The army was preparing for home island defense by teaching people to fight with sharpened bamboo sticks. Russia had just declared war and trounced a formerly elite army unit in Manchuria. It was crystal clear what the outcome was going to be. And even then there was a faction who felt surrender was dishonorable and wanted to continue fighting.

The bombing aspect alone destroyed 60% of Japanese cities. Are we willing to do that in Iran? The hope is the average Iranian hates their government and will use the opportunity to replace it. The thing is, as much as they may hate their government they hate the people who bombed their little girl's school even more.