Mara didn't instigate the red war
Ghaul arrived because the skyburners sent out a distress signal
One member of the nine actively participated in disrupting our satellites so ghaul could arrive undetected.
Mara played no part in that invasion or in the red war.
You are wrong.
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He gives a lore bit that suggests it's a possibility, she could and probably did. We've seen her interactions with the nine as well...and she wants power. You could be wrong.