The alternative whould had been get every monster dead, then every solarian warrior because as they said, they were unstable and whould had been dead.
Also, pretty sure the high comission deserve it, Hekapoo was ok with it, Star's spells would also accept their fate because they would do anything for her, the unicorns ended up corrupted and became dangerous, and Glossaryck is the one that prepared all of this.
And by the way, she didn't kill Lekmet, that was Toffee, and she did kill Toffee, so if you are gonna make a body count, you should replace Lekmet for Toffee.

Not really, people are forgetting she didn't do it on purpose, and she destroyed magic in order to stop mass genocide. Also the person she stopped Mina, had the intent of mass genociding, while Star killed magic to stop her, and did not know what would happen to magical creatures