If it is only avast that blocks, that could well be an indication for it to be an FP,
or are other vendors also alerting the site as suspicious/malicious?
Just unblocking does not solve any underlying vulnerabilities, not implementing best policies etc.
Ignorance here is not bliss.
An insecure website, without someone alerting, may mean a far greater risk,
as it may be open to abuse.
polonus (volunteer 3rd party cold recon website security-analyst and website error-hunter)