Why did Goku stop killing people?

[Logan]

Goku doesn't seem to kill his enemies for the sake of killing them. He seems more interested in leaving them incapacitated and with the knowledge that they won't ever beat him. Freeza is an example, if my memory serves me right.

Which begs the question of what would be done if they actually heeded his warning. Maybe they'd get sealed away by Kami?

[Hitiro]

Well, he didn't kill any "good guys" so to speak. Sorry, mis-worded that a bit, silly me.
Now that I think about it, he was escaping in a giant robot suit. He could've easily terrorized a village after escaping, or gone to hold people hostage. Vegeta was escaping offworld, while Jeice wouldn't really have anyone to kill since everyone was already dead. A thought that just occurred to me.

Under that assumption you are assuming Vegeta and Jeice wouldn't kill people on other worlds. Goku should have killed Vegeta because he goes to Namek and kills a handful of villages. Jeice would have left Namek and probably would have become a killer for hire, it was established that the Ginyu Tokusentai had really no rivals in the galaxy. So even if it is Jeice he could have still killed numerous people before someone strong enough came along to kill him. So really Goku was under the same scenario as letting General Black go off in the giant robot suit.

[Valerius Dover]

Well, he didn't kill any "good guys" so to speak. Sorry, mis-worded that a bit, silly me.
Now that I think about it, he was escaping in a giant robot suit. He could've easily terrorized a village after escaping, or gone to hold people hostage. Vegeta was escaping offworld, while Jeice wouldn't really have anyone to kill since everyone was already dead. A thought that just occurred to me.

Under that assumption you are assuming Vegeta and Jeice wouldn't kill people on other worlds. Goku should have killed Vegeta because he goes to Namek and kills a handful of villages. Jeice would have left Namek and probably would have become a killer for hire, it was established that the Ginyu Tokusentai had really no rivals in the galaxy. So even if it is Jeice he could have still killed numerous people before someone strong enough came along to kill him. So really Goku was under the same scenario as letting General Black go off in the giant robot suit.

Hmm, fair enough. I suppose it does come down to maturity or something, then. He goes back to killing people in GT.