In Aquaman, after Black Manta's father was dead, Black Manta gets revenge on Aquaman.
At times I feel like Aquaman just killed Manta's father for the sake of it. So why did Aquaman kill Black Manta's father?
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Actually, he didn't kill him, but refused to help. Black Manta's father was trapped due to a shot from his own weapon, as seen here.
His motivation for not helping was to punish him for killing sailors previously, lack of interest or he just didn't picture him dying.