If they had only listened to Tobirama...
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See the whole uchiha thing really wasn't tobirama's fault. In fact, we already know the uchiha didn't have a problem with Tobirama at all.. since there are no indications they did. And furthermore, the reason the village turned crap after Tobirama is because they 2 leaders who took control of the village didn't listen to the white haired beast.
"I will be the decoy… you are the bright young flames who must protect the village. Danzō, you and Saru have always been rivals in everything… But what we need now is unity. Don't bring your personal squabbles into this. It's true I was slow with my decision. First you must look within and know yourself without losing your calm. Right now you will just bring danger upon your friends. At any rate… Danzō… Saru… there's no need to be hasty at your age. One day the time will come. Just stay alive… until then."
1. Uchiha did the coup why? Because there was no unity ( you can watch the anime episode where they hold the uchiha meeting. )
2. Why were their dirty activities, like experimenting on konoha citizens, or something like the Root going on? Because there was no unity..
3. Why did Konoha look like a hypocrite? because there was no unity.
I mean if you look at the reign of the first 2 Hokage.. there really weren't any internal problems except Madara. People say Tobirama made the Uchiha into the police to segregate them so they won't mess with the village.. However, when we look at the Uchiha (anime here), all they talked about during the Coup meetings was PROTECTING KONOHA. lol. Its just that Uchiha would give their life for the village.. hence why making them the Police wasn't really a big mistake. Its just Hiruzen couldn't handle it.. and Danzo set them up for god knows why.
Sooo yeaaa Only if they had listened to Tobirama.