Is Sasuke really this naive?

[~Uzumaki~]

It was rather childish and stupid.

 

[hisou]

he has the Full right to say this
since Konoha elders and kages were watching the Uchiha clan gettin wiped out

The elders and the 3th only saw it happen. Rest of them not.
But that doesn't take away his (Sasuke) right to mention the methodes implemented by the 1st, 2nd, 3th to handle the Uchiha were mistakes and therefore them to be blamed for.