In Dragon Ball Z- Dragon Ball Super the primary antagonist is Frieza. He’s the only reoccurring primary antagonist in the canon. He’s a symbolic amalgamation of dragon celestial and dragon demon races. He represents the real life rulership of the celestial dragon race over monkey demons. Dragon Ball Z’s story of Frieza’s empire ruling over aliens is just symbolic for the dragon celestials ruling over all races and species of demons. The saiyans were just one of many races under Frieza’s empire - in real life monkey demons are just one of many demon species who are under the authority of Dragon celestials.
The saiyan race is a warrior race trained to kill and destroy taking orders from a race of dragons who have an empire in space. This is based off the reality of celestial dragons princes who give orders to demons to continue their domination over mankind existing on earth in the 3rd dimension.
Our fascination with Dragon Ball is literally based on the will of the spirits of the monkey demons whom the fictional saiyan race is a cartoonish exaggeration. So the real life version of Frieza and saiyans are literally on the same side. There’s no fighting between monkey and dragon; there’s no super saiyan; no god forms; no ui; no blowing up planets or being galaxy - multi universal in power tier; theres no shaking the universe through fighting. All of that is fantasy to keep you entertained on monkey demons and their celestial dragon masters who dominate them.