He had no room to be killing soldiers if he planned to take on Frieza, Zarbon, Dadoria and the Ginyu Force. Goku showed more Saiyan pride than him when he stopped Krillin from shanking his ass with Yajurobe's sword.
"What about Saiyan on Saiyan crime?" Freiza created the mentality, that made Vegeta the killer he is.
Goku has no saiyan pride, he just a retard looking for a sparing partner.