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The issue in question in case anyone is interested.
Manta's infanticide caused MAJOR rifts between Arthur and Mera AND Garth.
It had ramifications that lasted YEARS.
All at a time when this sort of stuff NEVER happened in comics!
Why DC choose to ignore it baffles me. Manta never has been and never SHOULD be heroic.
He is a cold hearted bastard who may be able to show glimpses of perceived kindness but really is too narcissistic to have any sort of real relationship.