[[ An interesting thought I just had.
Itachi’s own bias for Sasuke soured his own relationship with his Father, harshly criticizing every single ‘mistake’ Fugaku made, even though Itachi made a lot of those same mistakes and made excuses for himself.
Three times– two times specifically directed towards his Father, Itachi’s opinion of Fugaku grows worse as Fugaku does things Itachi perceives as insulting or damaging to Sasuke. Itachi doesn’t care much about how his Father treats him, (at least, not on a level that Itachi is acutely aware of), but when Fugaku does something that upsets Sasuke, or something Itachi thinks will disrupt Sasuke, Itachi grows angry.
The first instance is when the district is being built. All the adults are unhappy because they know why. They’ve been accused of the attack and are being sequestered to a corner of the village, forced to all live together. Itachi, child that he is, doesn’t understand why the adults can’t be happy their homes are being built first. The district, from Itachi’s point of view, will provide safety and peace where Itachi can raise Sasuke. Because Itachi perceives it in such a way it can benefit Sasuke, it’s not a bad thing and the adults are just “dumb.”
The second instance (and these last two may be out of order) is when Fugaku raises his voice at Itachi concerning his position between the clan and village. Itachi is angry– not because Fugaku is screaming at him, not because of the pressure, but because the noise level might wake Sasuke up. He has a thought in which he accuses his own Father of not caring for Sasuke at all, because as far as Itachi goes– if you cared, would you not let him sleep in peace? Once more, anything he could misconstrue as hurting Sasuke counts against his Father.
The third is when Fugaku says he won’t be available for Sasuke’s entrance ceremony, because of the importance of making sure Itachi’s entrance into ANBU goes correctly. For a third time– Itachi believes that Fugaku doesn’t care for Sasuke, because caring for Sasuke means putting him above all else (even if Itachi is guilty of contradicting himself of this. He has a special excuse for himself so he can believe he doesn’t do this.) Itachi goes as far as to outright try to cancel the mission, to manipulate his Father into going to the ceremony and appeasing Sasuke.
Now, as far as Itachi’s excuse goes… Itachi himself believes his work will benefit Sasuke in the end. It’s why he believes he can get away with putting Sasuke off or cancelling things he previously promised. The end will justify the means to him, and in the end it’s for Sasuke. Not truly logically sound, but this is how Itachi thinks. ]]


