I'm watching through Dragonball Kai at the moment. I watched DBZ back when I was a kid and its interesting to go through it again.
A lot of questions are coming to mind which the internet has answered (why is Frieza so strong for instance).
One however..... has not been answered that I can find.
I've just watched the episodes with Future Trunks defeating Frieza and talking to Goku.
Why does he simply give Goku some medicine (which is somehow still more advanced in the future despite the androids....) instead of going and stopping the androids before they are even created?
The typical answer could be 'he doesn't know where the secret lab is'. Yet he specifically says they're from an island near Minami city. And... well.
1: How big can an island be for beings with the power to destroy planets. He specifically says he isn't soft so I doubt he'd balk at chasing a few thousand from their homes then blowing up an island.
2: He has a time machine and he's just a kid. He can spend months or years searching if need be.
Of course. The real world universe answer is "Well that would make for a pretty dull manga/anime". But in universe?