Smithy did nothing wrong
>Used Exor as a dimensional spaceship to learn about new lands
>Crashed in Mario's world accidentally
>Smithy himself didn't even do anything, just working at his forge all day like a NEET autist, giving life
>His creations decided to fuck shit up, except
<Mack: Didn't damage or hurt anyone. His Shyguys bounced on some beds and scared people, but they just wanted to have fun
<Bowyer: Just wanted to practice his archery, some people got numb for a bit, but didn't get more than a slight bump on the noggin
<Punchinello: Ran into the mines to hide, and the mole kids just buggered off there by themselves
<Booster: Not affiliated with Smtihy, his tower implies he's been there for some time. Pulled the same tricks Bowser did so it's not like he's overly evil
<Yaridovich: At worst, kidnapped the villagers and shoved them in a shed against their will, but without undue aggression. Possibly tickled the elder
<Valentina: Tried to Usurp a kingdom, acting independently
<Axem Rangers: They stole a star from you and didn't annoy anyone
For all you know, Smithy could have been collecting the star pieces to give them back to Geno. He said he wanted to create a world filled with weapons, but that doesn't imply any kind of warmongering. It's a production job, he wanted to give everyone employement