Why the Saiyans went Super Saiyan

Goku Goku went SS on Namek because Frieza killed his best friend Krillin. And the anger from that caused him to go SS.
Vegeta Vegeta went SS on a deserted planet(unknown to). He went SS because he was trying to be stronger then Goku for years. He tries so hard but he can't. Then it hits him he doesnt want to be stronger then Goku and it snaps and he goes SS.
Gohan Gohan goes SS in the Hyperbolic Time Chamber. He goes SS because he thought of him being so weak and all the people dying from hes weakness. If he was stronger he would of saved those people. That triggers him to go SS.
Goten Goten goes SS by fighting his mother in their back yard. Chi Chi nails Goten in the face. Goten doesnt need the rage of pain to go SS. He just needs to think of beating the person and that triggers his SS power.
Chibi (kid) Trunks Trunks goes SS in the woods while fighting Goten. Same as Goten he doesn't need the rage. So he thinks of beating Goten and he goes SS.
Future Trunks Future Trunks went SS in a city that the androids destroyed while it was raining. He went SS because the cold blooded androids killed his master and best friend, Gohan. In his time the androids destroyed everything in there path. They destroyed Piccolo, Vegeta, Krillin, Tien, Yamcha, and Choutzu. Goku fell dead from a deadly heart virus 12 years before the androids attacked. Then they killed Gohan which caused Trunks to go SS.
More To Come...