Because people are too dumb to know what their talking about or completely forget shit that Father of Goku also did.
Here are a few incorrect criticisms of the Minus.>Bardock is a nice guy now
Except the manga literally opens with Bardock killing some aliens to take their world and he enjoys it. All that is shown is that he is concerned about his son which is fine with me because Father of Goku showed he wasn't a heartless bastard too.>It retcons a bunch of shit
It literally only retcons Father of Goku, and even then it doesn't outright because nothing says Bardock didn't go and make a last stand against Freeza when he intended to kill all the Saiyans.
Also Goku's age was never given in the original Manga. He is just said to be a baby, which 3 years old can be considered a baby too.
Here are a few things people forgot Father of Goku also did.>Minus just makes Goku into a Superman rip off
Father of Goku set up Bardock just like Jor-El with how he went to go warn the Saiyans but none of them believed him.>Minus turns Goku into a child of destiny
Just like Bardocks last vision in Father of Goku did.