Xenocide Goku got steadily less intelligent and responsible as he grew to adulthood.
Kid Goku: Oh my gosh, a trash can caught fire! This calls for a stern educational lecture.
Adult Goku: Hey wouldn't it be fun if we had a tournament where if I lose the universe gets destroyed. Motivational tool.
Quad9Damage Goku in vanilla DB is a different character. He is naive and mischievous but his heart is in the right place. Once he learns he's a Saiyan it awakens this selfish need to fight that constantly puts everyone in danger.
"I'm going to let Vegeta escape because he pushed me to my limit and I want to fight him again."
"I'm going to toy with the most diabolical tyrant in the universe until he decides to try and kill me."
"Now I have to wait for Freeza to build to 100% power even though the planet is exploding around me and he can survive in space."
"These Androids have wiped out most of humanity in the future but I'm not even going to investigate for three years because I want to fight them."
"I'm going to throw my son at Cell because of the hidden power reserve, but mostly because I assume he's as big an enthusiast about fighting as his daddy."
"I'm gonna pick a fight with the GOD OF DESTRUCTION also I need to feel the exhilarating power that comes from being a god."
"Fuck the Multiverse, I want to fight some strong guys."
I want to see an episode where Goku can't ride the cloud anymore.