system
Given the following post, respond as if you're commenting on Reddit:
human
[DBZ] Why didn't Future Trunks travel to New Namek after defeating the Androids and Cell to wish back the Z-Fighters?

From what I know, Porunga can wish people back no matter how many times they died. It would have taken Trunks a long time to get there but I think with the help of the present Goku, instant transmission could easily solve that.
gpt
Trunks couldn't find New Namek without Goku, who was able to lock on to the ki of New Namek. By the time recruiting present Goku became an option, the status of the world had been the status quo for so long it was best to just rebuild instead of bringing everyone back to try and make it how it was when Trunks was an infant. 

It's like, using time travel to kill Hitler is a popular idea, but then do you stop every single massacre that's ever happened? Every bad event at all? You gotta draw the line somewhere, and whenever the Z-Fighters used the Dragon Balls to undo horrible things, it was always immediately after. The atrocities of the androids had "settled" so to speak. An entire generation came to age in that world, and all governing bodies had been non-existent for the same amount of time. Hell, the dead people were probably perfectly happy living it up in heaven by that point.