Damn, that father-son Kamehameha. To me, honestly, this is the most disgusting thing recently happened to the DB franchise. The art itself alone may be acceptable at least (aside from the artistic flaws such as their inconsistent directions of eyes,) but I cannot stand Toyotaro's shallow-minded idea mentioned in his interview
. Bardock obviously has no place in the scene where Goku blows Freeza up. Even if he did, his position would be Freeza's side.
When it comes to the glorification of Bardock, the TV special already had a problem in the first place. Bardock is a ruthless fiend who has no qualms about killing people and ignores and swears at his own son solely for his low power level. Although he seems to have become somewhat aware of his identity and a sense of fellowship in his last moments, he still died as nothing but a scumbag. And then, they inserted his last line that says "Kakarot, inherit my will and you become the one to defeat Freeza." But what will? A personal grudge of a cold-blooded bastard? They glorified him out of nowhere by making him sound like a brave warrior who dedicated himself to the good of victims, which is not true. Don't get me wrong here; He is still a cool and fascinating character nonetheless, and the TV special is very well-made except for a few flaws like this sudden overglorification of the protagonist.
Toriyama was impressed by the TV special and decided to incorporate its story in the manga, but he seems to have not accepted everything from it. He overlaid Bardock's figure on Goku and let him even say that he fights for all the Namekians and Saiyans killed by Freeza. At that point, Goku is thinking about avenging his race to inspire himself in front of the powerful villain, but he fails to defeat Freeza by that will after all. What ultimately set his heart on fire was his personal emotion and sense of justice. Goku says that the Saiyans got what they deserved, and Freeza answers him back that it's not something like fatal karma and it actually was nothing but a result of his own selfish intention. In reaction to that, Goku says that he will destroy Freeza by his intention. The Saiyan race is no more really his concern at this point. It is why he is not interested in killing Freeza and stops fighting as soon as he feels satisfied. He is fighting for his own good here. However, Freeza betrays his mercy and Goku faces no choice but to finish him off despite himself, with yelling "Damned fool!" I think his cursing and blast were directed not only to Freeza's idiocy, but also the fate given by his Saiyan identity that ultimately led him to this ending. He sure virtually wreaked vengeance, but it was nothing but an irony. He didn't do it for his father's will.
From what I understand, Bardock and the other old Saiyans were all repelled by Goku, and he fought Freeza for himself. It was not obviously the moment of vengeance for his race when he killed Freeza. Toyotaro's idea is badly shallow and backed up only by the superficial drama of the situation.