because he knew that the Saiyans were getting stronger everyday and he couldn't control them.
He was also afraid that one would become a Super Saiyan and overthrow him.
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Yes, this is shown where Frieza was about to destroy the saiyan planet called "Vegeta". As Bardock was dying, he says "My Son" and he looked devastated.
I don't think that ever happened... Maybe in fan fiction or added content from Akira Toriyama, but it's just not possible he was not strong enough to survive Frieza's Supernova. Besides they show Bardock get torn to pieces by the attack before it goes through like 5000 other people and then Planet Vegeta.
tarble is Vegeta's younger brother, arrives on earth asking for help against some of Frieza's men.
First goku killed frieza on planet Namek then his dad fixed him and trunks (future trunks) killed him.
no that would be impossible because if you have seen the episode of dragonballzkai when vegeta kills dodoria then you might be able to think that if vegeta is about 3 times smalller then bardock then bardock could've easily killed him and the only reason bardock was killed by frieza is because look at it goku is the stongest in the show and he almost died fighting frieza (bardock and goku's poower levels are close o the same)