"-He's trying to bring peace to everyone's heart,living or death.The only way for it is by force,since there is too much people opposing him.Remember that he also wants peace and a happy world like Naruto.He wants his family back,his friends back,and everyone that fought for this world and died."
Madara specifically said when he faced Tobirama that this isn't about Izuna, Madara passed that point a LONG time ago (only committed to his plan) and it doesn't matter to him if gets his family back or not.
"Knowledge means power.That's why nobody understands Madara's actions.He knows too much about the corrupted shinoby system and tries to do something for it.Only the Uchihas understood him after he disappeared,and were preparing for the revolution."
the Uchiha's simply wanted to rule/overthrown the Leaf and take over, it was going to be a bigger massacre is they succeeded and their goal was to make THEMSELVES in a position of power and no one else, they only thought of what's in their best interest and when Madara wasn't doing what's good for them/was gonna get them in trouble they turned their backs on him.
Madara might not be evil (no one is really evil in this series except for maybe Oro) but, there's no excuse for forcing what you think is the solution on the whole world.