I think you should. Their not real members as you just added a hacked database with 60k members. They don't know the site exists and won't come back. Just remove them and yes you can just prune them.
Why not send a massmail, it helps a lot. Espescially when your site is new, you shouldnt delete them creating a community takes time, and people will register quicker if you see you have 60k members.
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