Taya's father got every right to become a villain but chose to have a human heart and save his child
Well done
He did become a villain though.
In the end he gave his life to save his daughter, but that doesn't excuse everything he did up to that point.
If it had just been his own kin that he killed(The cannibals), it would have been justified, but prior to going all Itachi and wiping out his clan, he attacked humans too.
If he hadn't fallen to temptation, he would have gotten to raise his daughter and tell her about her mother more, but instead he let bloodlust consume him