A lot of people seem to be missing the point of Venat's actions...
She was faced with imminent, absolute death of everything... or having to be a villain to her people so that a new people could have a chance at saving SOME form of life.
She chose the latter. She wasn't 'absolute good', and she is absolutely justifiably seen as evil to those she harmed... but the alternative was what? Meteion quashing literally all forms of life and leaving the universe with literally nothing in it.
Her people most likely couldn't have - they were too aetherically strong to deal with the dynamis.
She committed awful acts but in doing so secured a future for life as a concept.