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Obviously Rin was just the trigger to make him realize that the world was bathed in evil and corruption. People still think he started it over Rin because they just want something to ***** about.
Telling people they're idiots isn't going to get the message across, it will only stimulate they're idiotic minds even further.
I believe most people act like morons because deep down they hate the person that was behind the mask, aka they wanted it to be someone else, someone older and more experienced because that was the impression given by Obito in order to manipulate every living thing and use it to his advantage.
In a nutshell, Obito was underestimated and people are still in denial about it. They may or may not accept how bad ass he really is, who the F cares anyway?
The rest are just morons who can't decipher the manga for shit, even when it's bluntly stated by the character himself. Those are the true idiots, there is no hope for them.