The thing about #blocklists with false positives versus negatives:
I'm generally for optimizing for the false negative rate _but_ with a few caveats.
1. False positives should be bounded.
2. There needs to be a way to get off the list
3. When mistakes happen there needs to be a revocation process that is propagated automatically
4. This is for _individual_ blocklists. If you are blocking on behalf of _others_ or sharing your blocklist the calculus here changes and false positives _matter_