A father can love his sons and still refuse to stand on their side. Targum Pseudo-Jonathan preserves one of the hardest lines in Jacob's blessing — a public disavowal. "In their counsel my soul hath not had pleasure, and in their gathering against Shekem to destroy it mine honour was not united" (Genesis 49:6).
Jacob is talking about Shimon and Levi. After their sister Dinah was violated, the two brothers tricked the men of Shechem into circumcision, waited three days, and then killed every male while they were still in pain (Genesis 34:25). The Aramaic preserves Jacob's horror at the details: they "slew the prince and his ruler, and in their ill will they demolished the wall of their adversary."
The Targum is clear about what Jacob is refusing. Not anger at injustice — he had that himself. Not the defense of family — he approved of that. What he rejects is the collective rage that dissolves discernment, the kahal that gathers to destroy a whole city because some of its men did wrong. Jacob will not let his honor be folded into their strategy. A patriarch draws lines even around his own children, and this is one of them.