Even if the Uchiha were oppressed, to a degree, after the Kyuubi attack, I still find it hard to believe that every single adult, after putting their children lovingly to sleep, congregated to discuss clandestine plans for the destruction of the world. What else would they have done but have meetings of some sort, considering they were purposefully separated from the rest of the village for something none of those present did? Of course they would meet up occasionally to, at the very least, think how they could change their situation. The rest of Konoha still considered them elites, so it's only natural they would like to have an equal chance to lead the village as well.

I guess in a paramilitary environment like a ninja village, any meetings could be seen mutinous by the leadership, but nevertheless, there can't be any other reason but witless fear or insane hatred to slaughter them all down to the very last baby. I hope the truth will be revealed to the whole village when this is all over. That ought to make an interesting scene.