Is it "good" they got rooted out or is it "good" because they got rooted out? If the Gnostics had prevailed would you be calling the Roman church an "alien sect"?
If God were a woman would it rain fire from heaven every month?
The only answer to an absurd question is another absurd question.
The question is valid. The answer is an evasion. Why is it good and not bad they got rooted out?