Goku always acted selfish and stupidly in the anime going back as far as dragon ball, and I don't see why'd they change that in super. This is the same Goku who lent Frieza his Ki after defeating him, and gave Cell a senzu bean so he could fight Gohan at full strength, and hired Hit to assassinate him (and Hit technically succeeded). People really need to go back and watch DBZ episode by episode, because it there isn't as huge of a change in Goku or the canonical story progression between DBZ and DBS as your nostalgia is leading you believe.
I disagree and I dont think its really about Goku being stupid or not in super compared to dragonball z or dragonball.
I do think Goku has gotten more selfish in dragonball super though.
I am not saying that the more selfish attitude is good for someone to have, but for the story its at least interesting that the main character moves into that direction, as it is usually not the case.
Also daring, brave and admirable for the writers to move the main character's character development in that direction, instead of going for something like a hero altruistic type that usually works with many audiences.
Goku was more like that in dragonball z.
Goku had a massive sense for forgiveness in dbz and therefore he gave Frieza a second chance, after he couldnt resist Frieza's pleas to save him.
During the cell games the goal was for Gohan to be pushed into a corner so he would unleash his full power to defeat Cell. A power from Gohan that Goku had seen a glimpse off in the room of spirit and time.
Goku saw the sensu bean as part of creating that scenario of Gohan getting pushed into a corner and unleashing the power to save everyone. As Goku couldnt defeat Cell himself, yet he believed Gohan could.
Both these examples are not selfish.
They are done either out of forgiveness or with the well being of others in mind.
In dragonball super Goku has gotten more selfish or at least is less focussed on the well being of others.
He even hires Hit for assasination on himself, just as a means to get stronger.
Not because someone is threatening his loved ones and he needs to defeat that person.
No, just as a means to get stronger in general, for the sake of just wanting to get stronger (sort of an obsession/addition?). Even letting his friends and children know eventually about the assasination, who were worried, yet he continued with it.
He could have stopped after reviving himself with that energy wave, as Hit considered it to be a successful kill and considered the mission done, but Goku made him change his mind and resume the fight. All just for Goku wanting to experience Hit at his strongest and wanting to defeat him.
Goku knew that asking Zeno for the tournament could brings risks and those risks could harm others.
Whis and Beerus warned him.
He didnt take the warnings serious, even though he saw future Zeno destroy future Trunks his universe
and thus knows about potential risks with Zeno.
He didnt take the warnings serious even though Whis and Beerus know Zeno for way longer and have seen more what he can do.
Even though Whis and Beerus allow Goku and Vegeta to train on Beerus his planet.
Yet Goku went through with it anyway and asked Zeno.
Thats quite selfish and not respectful of Goku tbh.
Yes asking Zeno for the tournament turned out well.
As Zeno wanted to destroy several low mortal lvl universes already (including the one of his friend Goku btw, whereas Goku couldnt believe such a thing). The tournament can give universes a chance to save themselfs and prevent Zeno from erasing them.
So in a sense reminding Zeno of the tournament helped others instead of bringing extra risks.
Still that doesnt change the fact that Goku just wanted to tournament for selfish ways and that he did take a risk that could harm many.
A risk that was not about the well being of others.
A risk that was just about the desire to get stronger and fight strong opponents.
Not necessarily getting stronger to save people.
